{ "document_id": 15928, "filename": "PomperHS02-1.pdf", "engine": "paddleocr_vl", "source_run_id": 16039, "generated_at": "2026-11-04T12:05:54+00:00", "page_count": 5, "counts_by_type": { "caption": 3, "figure": 9, "footer": 28, "footnote": 7, "formula": 6, "header": 10, "heading": 4, "table": 3, "table_cell": 200, "text": 110, "title": 1 }, "timings": { "total_ms": 10180, "structure_ms": 4872, "text_layer_ms": 64, "build_ms": 145 }, "pages": [ { "document_id": 15928, "page": 1, "width": 603, "height": 783, "rotation": 0, "pipeline_version": "paddleocr-vl-1.6+paul-48", "width_pt": 603, "height_pt": 783, "engine": "paddleocr_vl", "source_run_id": 16039, "item_count": 34, "counts_by_type": { "figure": 1, "footer": 5, "footnote": 3, "header": 2, "text": 22, "title": 1 }, "build_ms": 6, "items": [ { "id": "p1.1", "order": 1, "type": "header", "bbox": { "l": 44.1585, "t": 775.748, "r": 183.2794, "b": 761.6834 }, "text": "📚 📚 📚 📚", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 0 }, { "id": "p1.2", "order": 2, "type": "figure", "bbox": { "l": 295.605, "t": 773.3306, "r": 306.9662, "b": 760.1451 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image" }, "reading_order": 1 }, { "id": "p1.3", "order": 3, "type": "header", "bbox": { "l": 419.7206, "t": 775.748, "r": 558.8415, "b": 761.9032 }, "text": "□", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 2 }, { "id": "p1.4", "order": 4, "type": "text", "bbox": { "l": 78.6708, "t": 719.7095, "r": 194.6406, "b": 708.5018 }, "text": "HORTSCIENCE 37(2):329–333. 2002.", "reading_order": 3 }, { "id": "p1.5", "order": 5, "type": "title", "bbox": { "l": 78.2421, "t": 702.1288, "r": 379.8493, "b": 619.2798 }, "text": "Growth Enhancement of Container-grown Pawpaw Seedlings as Influenced by Media Type, Root-zone Temperature, and Fertilization Regime", "attrs": { "block_label": "doc_title" }, "level": 2, "reading_order": 4 }, { "id": "p1.6", "order": 6, "type": "text", "bbox": { "l": 78.2421, "t": 612.9068, "r": 335.9051, "b": 590.4914 }, "text": "Kirk W. Pomper[p1.6.1], Desmond R. Layne[p1.6.2], Snake C. Jones[p1.6.3], and Michael G. Kwantes [p1.6.4]", "children": [ { "id": "p1.6.1", "order": 7, "type": "text", "bbox": { "l": 78.2421, "t": 612.9068, "r": 335.9051, "b": 590.4914 }, "text": "¹", "attrs": { "inline": true, "text_offset": 14, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p1.6.2", "order": 8, "type": "text", "bbox": { "l": 78.2421, "t": 612.9068, "r": 335.9051, "b": 590.4914 }, "text": "²", "attrs": { "inline": true, "text_offset": 40, "text_span": 8, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p1.6.3", "order": 9, "type": "text", "bbox": { "l": 78.2421, "t": 612.9068, "r": 335.9051, "b": 590.4914 }, "text": "³", "attrs": { "inline": true, "text_offset": 64, "text_span": 8, "bbox_estimated": true }, "reading_order": 2 }, { "id": "p1.6.4", "order": 10, "type": "text", "bbox": { "l": 78.2421, "t": 612.9068, "r": 335.9051, "b": 590.4914 }, "text": "⁴", "attrs": { "inline": true, "text_offset": 97, "text_span": 8, "bbox_estimated": true }, "reading_order": 3 } ], "reading_order": 5 }, { "id": "p1.7", "order": 11, "type": "text", "bbox": { "l": 78.0277, "t": 590.2717, "r": 381.1354, "b": 567.6365 }, "text": "Kentucky State University, Land Grant Program, 129 Atwood Research Facility, Frankfort, KY 40601-2355", "reading_order": 6 }, { "id": "p1.8", "order": 12, "type": "text", "bbox": { "l": 78.0277, "t": 562.8019, "r": 353.6971, "b": 542.1445 }, "text": "Additional index words. Asimina triloba, bottom heat, chlorophyll, root : shoot ratio, Kentucky banana", "reading_order": 7 }, { "id": "p1.9", "order": 13, "type": "text", "bbox": { "l": 77.1703, "t": 538.1889, "r": 381.5642, "b": 296.6742 }, "text": "Abstract. Pawpaw [Asimina triloba (L.) Dunal] is a native American fruit tree that has potential as a new fruit crop or for use in landscapes, but little information is available to nurseries on the production of containerized plants. In greenhouse experiments, growth of pawpaw seedlings in Rootrainers was examined in three fertilization regimes, two root-zone temperatures, and four substrates [ProMix, 6 pine bark : 1 sand (v/v), 1 sand : 1 sphagnum peat, and 4 pine bark : 1 sand : 1 sphagnum peat medium]. A similar germination rate of 80% was obtained in all substrates. Weekly fertigation treatments were imposed when seedlings had 2 to 3 leaves, at 0, 50, and 100 mg·L[p1.9.1] N as Peters 20N–8.6P–16.6K water-soluble fertilizer plus soluble trace elements. After 140 days at the highest fertilizer rate, plant height, leaf number, and dry weight (roots, shoots, and total plant) were greater in ProMix and 1 sand :1 sphagnum peat than in 6 pine bark :1 sand (v/v) or 4 pine bark :1 sand :1 sphagnum peat. Also, the root : shoot ratio was lower in ProMix and 6 pine bark :1 sand (v/v). Overall, plant biomass production was greater in ProMix than in 6 pine bark :1 sand (v/v). In a separate experiment, bottom heat (32 ± 0.3 °C) hastened seedling emergence from ProMix by 9 days compared to ambient root-zone conditions (24 ± 0.2 °C). An average seedling height of 10 cm was attained by ambient plants 79 days after sowing, whereas seedlings with bottom heat reached this height after 69 days. Seedlings subjected to bottom heat had increased leaf number (30%), plant height (32%), whole plant leaf area (94%), shoot dry weight (104%), root dry weight (50%), lateral root dry weight (125%), and total plant dry weight (87%). Seedlings with bottom heat had a reduction in root : shoot ratio of 25% and in specific leaf dry weight of 16% compared to ambient plants. Seedlings subjected to bottom heat had a higher leaf chlorophyll (chl) concentration of chl a (39%), chl b (33%), chl p (43%), total chl (38%), and chl a : b ratio (8%) than seedlings grown without bottom heat. Pawpaw seedling growth was best using ProMix with 100 mg·L[p1.9.2] N Peters applied once weekly, or using ProMix with bottom heat and 50 mg·L[p1.9.3] N Peters applied twice per week.", "attrs": { "block_label": "abstract" }, "children": [ { "id": "p1.9.1", "order": 14, "type": "text", "bbox": { "l": 77.1703, "t": 538.1889, "r": 381.5642, "b": 296.6742 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 677, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p1.9.2", "order": 15, "type": "text", "bbox": { "l": 77.1703, "t": 538.1889, "r": 381.5642, "b": 296.6742 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 2142, "text_span": 8, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p1.9.3", "order": 16, "type": "text", "bbox": { "l": 77.1703, "t": 538.1889, "r": 381.5642, "b": 296.6742 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 2225, "text_span": 8, "bbox_estimated": true }, "reading_order": 2 } ], "reading_order": 8 }, { "id": "p1.10", "order": 17, "type": "text", "bbox": { "l": 77.8134, "t": 288.5431, "r": 226.1518, "b": 241.0752 }, "text": "Pawpaw is a native American fruit tree that has potential for use as a new fruit crop or in landscapes (Darrow, 1975; Layne, 1996). Possessing a unique, almost tropical flavor, resembling a blend of banana, mango and", "reading_order": 9 }, { "id": "p1.11", "order": 18, "type": "text", "bbox": { "l": 232.797, "t": 288.5431, "r": 381.3498, "b": 169.2141 }, "text": "pineapple, pawpaw fruit have excellent fresh market and processing potential. Difficulties in nursery propagation have been a major factor in limiting development of a commercial pawpaw fruit industry. Recently, improved seedling and clonal propagation techniques for pawpaw have been demonstrated (Finneseth et al., 1998a, 1998b, 2000; Layne, 1996; Pomper et al., 2002). However, further improvements in cultural methods for the production of robust pawpaw seedlings for grafting or planting directly into orchards or landscapes would be desirable.", "reading_order": 10 }, { "id": "p1.12", "order": 19, "type": "text", "bbox": { "l": 232.797, "t": 169.2141, "r": 381.5642, "b": 67.2461 }, "text": "Pawpaw is often difficult to propagate by seed in the field. Germination rate in the field declines significantly if pawpaw seed becomes dry. Reducing seed moisture content from 37% to 25% reduces viability by 50% (Finneseth et al., 1998a). Damage to the delicate root system of field-dug pawpaw seedlings can also lead to poor seedling establishment (Layne, 1996). Due to the problems encountered by field propagation, most commercial nurseries in the United States prop\nElevated soil temperatures have been reported to significantly increase nutrient uptake and dry weight gain in passionfruit (Passiflora edulis f. edulis and Passiflora edulis f. flavicarpa; Menzel et al., 1994), flowering and stem length for hydroponically grown roses (Rosa ×hybrida L.; Moss, 1984), and nitrogen accumulation by apple trees [Malus ×sylvestris (L.) Mill. var. domestica (Borkh.) Mansf.; Toselli et al., 1999]. Hurewitz and Janes (1983) reported that tomato (Lycopersicon esculentum Mill.) leaf carbon exchange rate and leaf area increased as soil temperature was increased to[p1.12.1]. However, root-zone temperatures[p1.12.2] have been reported to restrict plant growth in some vegetable crops (Bode-Stoltzfus et al., 1998; Hurewitz and Janes, 1983; Klock et al., 1996) and several temperate tree species (Graves and Aiello, 1997; Graves et al., 1989, 1991). In", "children": [ { "id": "p1.12.1", "order": 20, "type": "text", "bbox": { "l": 232.797, "t": 169.2141, "r": 381.5642, "b": 67.2461 }, "text": "30 °C", "attrs": { "inline": true, "text_offset": 1064, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p1.12.2", "order": 21, "type": "text", "bbox": { "l": 232.797, "t": 169.2141, "r": 381.5642, "b": 67.2461 }, "text": ">30 °C", "attrs": { "inline": true, "text_offset": 1106, "text_span": 9, "bbox_estimated": true }, "reading_order": 1 } ], "reading_order": 11 }, { "id": "p1.13", "order": 22, "type": "text", "bbox": { "l": 387.995, "t": 718.391, "r": 536.7622, "b": 635.3222 }, "text": "gate pawpaw trees in containers (1998 KSU Nursery Survey, unpublished). This results in a significantly greater cost to the purchaser; however, these trees usually have strong, healthy root systems at transplanting. Our long-term goal is to enhance container production of robust pawpaw seedlings that would be well suited either for grafting or for transplanting to orchards or home landscapes.", "reading_order": 12 }, { "id": "p1.14", "order": 23, "type": "text", "bbox": { "l": 387.5663, "t": 635.9815, "r": 536.9765, "b": 250.5248 }, "text": "Container medium plus form and application rate of N can significantly affect growth of woody species (Aiello and Graves, 1997; Cruz et al., 1993; Sartain and Ingram, 1984). Because of its relatively low cost, light weight, and availability, pine bark alone or blended with sand, sphagnum peat, or perlite is a common substrate used by nurseries in the south-eastern United States for container grown plants (Davidson et al., 2000; Hartmann et al., 1997). Japanese maple (Acer palmatum Thunb.), sugar maple (Acer saccharum Marsh.), redbud (Cercis canadensis L.), flowering dogwood (Cornus florida L.), kousa dogwood (Cornus kousa), golden-rain tree (Koelreuteria paniculata Laxm.), saucer magnolia (Magnolia ×soulangiana Soul.-Bod.), blackgum (Nyssa sylvatica Marsh.), and pin oak (Quercus palustris Muench.) have been grown successfully with pine bark that is supplemented with micronutrients (Wright et al., 1999). Chinese chestnut (Castanea mollissima Bl.), American chestnut [C. dentata (Marsh.)], and Japanese chestnut (C. crenata Sieb.) seedlings have been grown successfully with a 6 pine bark: 1 sand (v/v) substrate (Huang, et al., 1994). Green ash (Fraxinus pennsylvanica Marsh.) and red oak (Quercus rubra L.) seedlings have been propagated successfully with 3 pine bark: 1 peat moss: 1 sand (v/v) substrate (Arnold and Struve, 1989). Pawpaw seedlings have been grown successfully in containers with a 1 peat moss: 1 pine bark: 1 vermiculite (v/v) medium (Nash and Graves, 1993) and also using well-aerated growing substrate such as ProMix 'BX', which contains sphagnum peat (75% to 85% by volume), perlite, vermiculite, macronutrients, and micronutrients (Layne, 1996). However, no studies have compared growth substrates or developed a fertilization regime for enhanced container production of pawpaw seedlings.", "reading_order": 13 }, { "id": "p1.15", "order": 24, "type": "footer", "bbox": { "l": 520.685, "t": 58.8953, "r": 536.1191, "b": 49.2259 }, "text": "329", "attrs": { "block_label": "number" }, "reading_order": 14 }, { "id": "p1.16", "order": 25, "type": "footnote", "bbox": { "l": 78.2421, "t": 234.922, "r": 226.5805, "b": 163.9399 }, "text": "Received for publication: 6 Mar. 2001. Accepted for publication: 26 Aug. 2001. This research was supported by U.S. Dept. of Agriculture, Cooperative State Research, Education, and Extension Service Agreement no. KYX-10-97-28P. We thank R. Neal Peterson (founder of The PawPaw Foundation) for supplying seed used in this study. The technical assistance of E. Reed, Jr. is also gratefully acknowledged.", "attrs": { "block_label": "footnote" }, "reading_order": 15 }, { "id": "p1.17", "order": 26, "type": "footnote", "bbox": { "l": 79.5283, "t": 161.7424, "r": 226.3662, "b": 70.982 }, "text": "Principal investigator of horticulture and curator, U.S. Dept. of Agriculture National Clonal Germplasm Repository for Asimina spp., Kentucky State Univ., and President of The PawPaw Foundation. To whom reprint requests should be addressed.\n\n [p1.17.1]Assistant professor of pomology and extension fruit specialist, Dept. of Horticulture, Box 340375, Clemson Univ., Clemson, S.C. 29634-0375\n\n [p1.17.2]Research assistant, Horticulture Program, Kentucky State Univ.\n\n [p1.17.3]Former research assistant, Horticulture Program, Kentucky State Univ.", "attrs": { "block_label": "footnote" }, "children": [ { "id": "p1.17.1", "order": 27, "type": "text", "bbox": { "l": 79.5283, "t": 161.7424, "r": 226.3662, "b": 70.982 }, "text": "²", "attrs": { "inline": true, "text_offset": 243, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p1.17.2", "order": 28, "type": "text", "bbox": { "l": 79.5283, "t": 161.7424, "r": 226.3662, "b": 70.982 }, "text": "³", "attrs": { "inline": true, "text_offset": 393, "text_span": 9, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p1.17.3", "order": 29, "type": "text", "bbox": { "l": 79.5283, "t": 161.7424, "r": 226.3662, "b": 70.982 }, "text": "⁴", "attrs": { "inline": true, "text_offset": 467, "text_span": 9, "bbox_estimated": true }, "reading_order": 2 } ], "reading_order": 16 }, { "id": "p1.18", "order": 30, "type": "footnote", "bbox": { "l": 78.2421, "t": 59.7743, "r": 216.2911, "b": 48.3469 }, "text": "HORTSCIENCE, Vol. 37(2), APRIL 2002", "attrs": { "block_label": "footnote" }, "reading_order": 17 }, { "id": "p1.19", "order": 31, "type": "footer", "bbox": { "l": 43.3011, "t": 26.5908, "r": 86.3878, "b": 18.4597 }, "text": "6807, p. 329-333", "attrs": { "block_label": "footer" }, "reading_order": 18 }, { "id": "p1.20", "order": 32, "type": "footer", "bbox": { "l": 155.8411, "t": 26.371, "r": 167.2023, "b": 18.8992 }, "text": "329", "attrs": { "block_label": "number" }, "reading_order": 19 }, { "id": "p1.21", "order": 33, "type": "footer", "bbox": { "l": 296.0338, "t": 22.6351, "r": 306.3231, "b": 10.9879 }, "text": "", "attrs": { "block_label": "footer_image" }, "reading_order": 20 }, { "id": "p1.22", "order": 34, "type": "footer", "bbox": { "l": 362.486, "t": 27.0303, "r": 406.2158, "b": 18.8992 }, "text": "3/15/02, 2:24 PM", "attrs": { "block_label": "footer" }, "reading_order": 21 } ] }, { "document_id": 15928, "page": 2, "width": 603, "height": 783, "rotation": 0, "pipeline_version": "paddleocr-vl-1.6+paul-48", "width_pt": 603, "height_pt": 783, "engine": "paddleocr_vl", "source_run_id": 16039, "item_count": 33, "counts_by_type": { "figure": 1, "footer": 6, "header": 3, "heading": 2, "text": 21 }, "build_ms": 10, "items": [ { "id": "p2.1", "order": 1, "type": "header", "bbox": { "l": 45.6591, "t": 775.3084, "r": 183.2794, "b": 761.6834 }, "text": "🛒 🎉 🎉 🎉", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 0 }, { "id": "p2.2", "order": 2, "type": "figure", "bbox": { "l": 295.8194, "t": 772.4516, "r": 306.7519, "b": 760.8044 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image" }, "reading_order": 1 }, { "id": "p2.3", "order": 3, "type": "header", "bbox": { "l": 419.7206, "t": 775.748, "r": 558.8415, "b": 761.9032 }, "text": "□", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 2 }, { "id": "p2.4", "order": 4, "type": "header", "bbox": { "l": 207.5023, "t": 738.6088, "r": 382.2073, "b": 727.6208 }, "text": "SOIL MANAGEMENT, FERTILIZATION, & IRRIGATION", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 3 }, { "id": "p2.5", "order": 5, "type": "text", "bbox": { "l": 65.8091, "t": 717.9514, "r": 213.0757, "b": 599.062 }, "text": "‘Rotundifolia’ holly (Ilex crenata Thunb.), leaf chlorophyll levels decreased with root-zone temperatures >30 °C (Ruter and Ingram, 1992). Some tree species do tolerate elevated root-zone temperatures. Root-zone temperatures as high as 36 °C did not reduce whole plant dry weight production in thornless honey locust (Gleditsia triacanthos L. var. inermis Willd.) compared to 25 °C (Klock et al., 1996). Increasing root-zone temperatures to enhance the early growth and development of container grown pawpaw seedlings has not been reported in the literature.", "reading_order": 4 }, { "id": "p2.6", "order": 6, "type": "text", "bbox": { "l": 65.8091, "t": 598.8423, "r": 213.5044, "b": 524.1243 }, "text": "Therefore, the objectives of this study were: 1) to compare the effects of several media and fertilizer regimes on germination and growth of container-grown pawpaw seedlings; and 2) to determine if an increased root-zone temperature would enhance early growth and development of container-grown pawpaw seedlings in the greenhouse.", "reading_order": 5 }, { "id": "p2.7", "order": 7, "type": "heading", "bbox": { "l": 98.6065, "t": 515.1142, "r": 180.9214, "b": 505.8844 }, "text": "Materials and Methods", "attrs": { "block_label": "paragraph_title" }, "level": 3, "reading_order": 6 }, { "id": "p2.8", "order": 8, "type": "text", "bbox": { "l": 65.166, "t": 497.9731, "r": 214.5763, "b": 67.0264 }, "text": "Plant material. For all experiments, paw-\npaw seed was harvested from open-pollinated\nhalf-sibling trees at the Western Maryland\nResearch and Education Center in Keedysville,\nMd. Seed was stratified at 5 °C for 3 months\nand sown to a 3 cm depth in substrate in 5 × 6.4\n×25.4 cm (740 cm³) containers (Rootrainers;\nHummert Int., Earth City, Mo.). In all\nexperiments, Rootrainers were watered at\nleast weekly to runoff during germination.\nSeedlings were grown in a white-washed\ngreenhouse under a 16-h photoperiod\nsupplemented by high pressure sodium lights.\nPhotosynthetic photon flux was measured at\ncanopy level on a clear sunny representative\nday at 1200 HR at 1200 μmol·m⁻²·s⁻¹ by using\na LI-COR LI-185B photometer with a quant-\num sensor (LI-COR, Lincoln, Nebr.).\nExpt. 1, substrate study. The growth and development of pawpaw seedlings was compared in a factorial experiment in the greenhouse using three fertilizer treatments and four potting substrates: ProMix ‘BX’, 6 pine bark : 1 sand (v/v), 1 sand : 1 sphagnum peat, and 4 pine bark : 1 sand : 1 sphagnum peat. Fertilizer treatments were 0, 50, and 100 mg·L ⁻¹ N as Peters (Scotts Co., Marysville, Ohio) 20N–8.6P–16.6K water-soluble fertilizer plus soluble trace elements. Experimental treatments were in a split-plot arrangement in three replicated blocks (main plot: fertilizer level, subplot: potting substrate) on three benches in the greenhouse. There were 10 replicate seedlings in each subplot. Blocks were arranged along the long, east-west axis of the greenhouse. The greenhouse air temperature was measured every 30 min during the experiment using TEMP HOBO sensors (Onset Computer Corp., Pocasset, Mass.). Average greenhouse air temperatures were 29.1 ± 0.7 °C and 21.2 ± 0.1 °C, at 1200 HR and 300 HR, respectively (± SE), during the experiment. In early March, stratified pawpaw seed were sown in 740-mL Rootrainers containing the substrate treatments. ProMix ‘BX’ (Premier Horticulture, Red Hill, Penn.) was purchased, whereas the other substrates were made by combining aged, but not composted, pine bark (GSO America, Columbus, Ohio), mason sand (Quikrete All Purpose Sand, Atlanta, Ga) or sphagnum peat (Southern Importers, Greensboro, N.C.).", "reading_order": 7 }, { "id": "p2.9", "order": 9, "type": "text", "bbox": { "l": 220.364, "t": 717.9514, "r": 368.7025, "b": 672.0219 }, "text": "made by combining aged, but not composted, pine bark (GSO America, Columbus, Ohio), mason sand (Quikrete All Purpose Sand, Atlanta, Ga) or sphagnum peat (Southern Importers, Greensboro, N.C.).", "reading_order": 8 }, { "id": "p2.10", "order": 10, "type": "text", "bbox": { "l": 220.5784, "t": 671.5824, "r": 368.7025, "b": 507.4227 }, "text": "Substrate bulk density was determined for three replicates for each substrate after heating for 24 h at 50 °C. Substrate pH was measured using 250 mL substrate and distilled water (1:1 v/v). Water holding capacity for each was determined by weighing 250 mL of substrate in 250-mL beakers before and after saturating the substrate and allowing it to drain from inverted beakers. Substrate analysis (Division of Regulatory Services, Univ. of Kentucky, Lexington) was performed on samples of all the substrate used in the experiment for electrical conductivity (EC), as well as N-nitrate, P, K, Ca, and Mg concentration. Cation exchange capacity (CEC) for each medium was determined by using an ammonia substitution method (A&L Analytical Laboratories, Memphis, Tenn.).", "reading_order": 9 }, { "id": "p2.11", "order": 11, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "Plant height and seed germination percentage were determined in each medium at the 2 to 3 leaf stage. Weekly fertilization treatments were also initiated at this time by saturating media with the appropriate liquid fertilizer. Plants were watered daily. Fertilizer treatments were prepared from a stock solution and applied by hand to the growing media; water used for preparation of the treatments had a total N content ([p2.11.1] and[p2.11.2]) of[p2.11.3] mg·L[p2.11.4] and a Ca concentration of 35 mg·L[p2.11.5] (Scott Laboratories, Allentown, Pa.). The number of leaves per plant and seedling height were determined 70 d after imposition of fertilizer treatments, which was 140 d after sowing. Immediately thereafter, stems, leaves, and roots were oven-dried at 70 °C for 48 h and weighed.", "children": [ { "id": "p2.11.1", "order": 12, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "NO₃", "attrs": { "inline": true, "text_offset": 422, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p2.11.2", "order": 13, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "NH₄", "attrs": { "inline": true, "text_offset": 435, "text_span": 9, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p2.11.3", "order": 14, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "≈ 0.7", "attrs": { "inline": true, "text_offset": 448, "text_span": 9, "bbox_estimated": true }, "reading_order": 2 }, { "id": "p2.11.4", "order": 15, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 462, "text_span": 9, "bbox_estimated": true }, "reading_order": 3 }, { "id": "p2.11.5", "order": 16, "type": "text", "bbox": { "l": 221.0071, "t": 506.7634, "r": 368.9168, "b": 342.6037 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 505, "text_span": 9, "bbox_estimated": true }, "reading_order": 4 } ], "reading_order": 10 }, { "id": "p2.12", "order": 17, "type": "text", "bbox": { "l": 220.364, "t": 342.6037, "r": 368.9168, "b": 66.8066 }, "text": "Expt. 2, root-zone heating study. A greenhouse experiment was conducted with treatments that included two levels of root-zone temperature, ambient (24 ± 0.2 °C) and bottom-heat (32 ± 0.3 °C), to determine the influence of elevated soil temperature on early growth and development of container-grown pawpaw seedlings. Treatments were arranged on greenhouse benches in three replicated blocks, with 10 seedlings per treatment in each block. Seeds were sown in early September in Rootrainer cells containing ProMix. All Rootrainers were placed on sheets of Dow foam insulation (10 × 20 × 2 cm) on the bench. For the bottom-heat treatments only, the heat mat was placed directly on the foam sheet. In addition, the four sides of the Rootrainers were enclosed using the same insulation. Sides went from the bench to the top of the Rootrainer. A greenhouse temperature regime of 27 ± 0.8 °C day and 21 ± 0.2 °C night was maintained and was confirmed on a representative clear day and night. Soil temperature was elevated using ProGro propagation mats (Hummert Int., Earth City, Mo.). Average mean soil temperature was determined over a 5-d period in adjacent cells in the same zone within treatment blocks by using a soil temperature probe (Digi-Sense model 8525-00; Cole Parmer Inst. Co., Niles, Ill.) inserted to a depth of 8 cm.\n\nA delivery rate of 50 mg·L⁻¹ N as Peters 20N–8.6P–16.6K water-soluble fertilizer was applied twice weekly after seedling emergence until substrate saturation, using a Gewa proportioner (Hummert Int.). Fertilizer delivery rates were confirmed by solution analysis (Scott Laboratories, Allentown, Pa.). The fertilizer solution had a pH of 6.2 and EC was 1.56 dS·m⁻¹.", "reading_order": 11 }, { "id": "p2.13", "order": 18, "type": "text", "bbox": { "l": 375.3477, "t": 635.1024, "r": 524.1148, "b": 516.4328 }, "text": "The number of days from sowing to seedling emergence from the substrate was evaluated. Following seedling emergence, seedlings were rogued based on size to a total of 30 seedlings per treatment. When seedlings produced three unfolded leaves, fertilization treatments began, and plant height and unfolded leaf number were measured weekly for all plants. After 114 d, shoot and taproot length, leaf number, and total leaf area (using model CI-203 area meter; C.I.C., Vancouver, Wash.) were determined. Stems, leaves, and roots were ovendried at[p2.13.1] for 48 h and weighed.", "children": [ { "id": "p2.13.1", "order": 19, "type": "text", "bbox": { "l": 375.3477, "t": 635.1024, "r": 524.1148, "b": 516.4328 }, "text": "70 °C", "attrs": { "inline": true, "text_offset": 542, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 12 }, { "id": "p2.14", "order": 20, "type": "text", "bbox": { "l": 375.562, "t": 515.9933, "r": 523.9005, "b": 397.9829 }, "text": "Chlorophyll determination. Immediately prior to destructive harvest, four discs (0.32 cm² each) were obtained from apical, medial and basal expanded leaves using a paper hole punch. Leaf discs were extracted for at least 24h in the dark using N,N-dimethylformamide (Sigma, St. Louis). Extract absorbance was read at 625, 647, and 664 nm using a UV-VIS spectrophotometer (Beckman Instruments, Fullerton, Calif.). Chlorophyll (chl) a, b, and protochlorophyll (chl p) concentrations were determined according to the method of Moran (1982).", "reading_order": 13 }, { "id": "p2.15", "order": 21, "type": "text", "bbox": { "l": 375.7764, "t": 397.3236, "r": 524.3292, "b": 296.2346 }, "text": "Statistical analysis. Data for leaves per plant, seedling height, total shoot, root, and plant dry weight, leaf area, average plant specific leaf dry weight (SLW), root: shoot ratio, chl concentration, and chl a:b ratio in relation to treatments were subjected to GLM analysis of variance using the statistical program Costat (CoHort Software, Monterey, Calif.). Treatment means were separated based on the least significant difference (LSD) or independent t tests.", "reading_order": 14 }, { "id": "p2.16", "order": 22, "type": "heading", "bbox": { "l": 436.2264, "t": 286.5653, "r": 463.8791, "b": 276.8959 }, "text": "Results", "attrs": { "block_label": "paragraph_title" }, "level": 3, "reading_order": 15 }, { "id": "p2.17", "order": 23, "type": "text", "bbox": { "l": 375.1333, "t": 269.6438, "r": 524.5435, "b": 66.5869 }, "text": "Expt. 1, substrate study. The container substrates differed significantly in bulk density, pH, water retention, water holding capacity, EC, and CEC (Table 1). ProMix had the lowest density, whereas 1 sand : 1 sphagnum peat had the greatest density, almost 7 times that of ProMix. Substrate pH ranged from 5.1 for 6 pine bark : 1 sand (v/v) to 5.8 for 4 pine bark : 1 sand : 1 sphagnum peat. Water holding capacity of ProMix was almost 8 times greater than that of other substrates. The EC of 6 pine bark : 1 sand (v/v) was about half that of ProMix, and values for 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat were only about one-quarter that of ProMix. On a weight basis, the CEC of ProMix was [p2.17.1]10-fold greater than that of the other substrates. On a volume basis, the CEC of ProMix was [p2.17.2]2-fold greater than 1 sand : 1 sphagnum peat or 4 pine bark : 1 sand : 1 sphagnum peat, and [p2.17.3]4-fold greater than 6 pine bark : 1 sand (v/v). The Ca concentration", "children": [ { "id": "p2.17.1", "order": 24, "type": "text", "bbox": { "l": 375.1333, "t": 269.6438, "r": 524.5435, "b": 66.5869 }, "text": "≈", "attrs": { "inline": true, "text_offset": 720, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p2.17.2", "order": 25, "type": "text", "bbox": { "l": 375.1333, "t": 269.6438, "r": 524.5435, "b": 66.5869 }, "text": "≈", "attrs": { "inline": true, "text_offset": 821, "text_span": 9, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p2.17.3", "order": 26, "type": "text", "bbox": { "l": 375.1333, "t": 269.6438, "r": 524.5435, "b": 66.5869 }, "text": "≈", "attrs": { "inline": true, "text_offset": 922, "text_span": 9, "bbox_estimated": true }, "reading_order": 2 } ], "reading_order": 16 }, { "id": "p2.18", "order": 27, "type": "text", "bbox": { "l": 386.2801, "t": 59.5546, "r": 523.4717, "b": 48.3469 }, "text": "HORTSCIENCE, VOL. 37(2), APRIL 2002", "reading_order": 17 }, { "id": "p2.19", "order": 28, "type": "footer", "bbox": { "l": 66.6665, "t": 59.1151, "r": 82.7437, "b": 49.4457 }, "text": "330", "attrs": { "block_label": "footer" }, "reading_order": 18 }, { "id": "p2.20", "order": 29, "type": "footer", "bbox": { "l": 7.0739, "t": 28.7884, "r": 24.6516, "b": 21.5363 }, "text": "——", "attrs": { "block_label": "footer" }, "reading_order": 19 }, { "id": "p2.21", "order": 30, "type": "footer", "bbox": { "l": 43.5155, "t": 26.5908, "r": 86.3878, "b": 18.6795 }, "text": "6807, p. 329-333", "attrs": { "block_label": "footer" }, "reading_order": 20 }, { "id": "p2.22", "order": 31, "type": "footer", "bbox": { "l": 156.0555, "t": 26.371, "r": 167.2023, "b": 18.8992 }, "text": "330", "attrs": { "block_label": "number" }, "reading_order": 21 }, { "id": "p2.23", "order": 32, "type": "footer", "bbox": { "l": 296.2481, "t": 22.4154, "r": 306.1088, "b": 11.2077 }, "text": "", "attrs": { "block_label": "footer_image" }, "reading_order": 22 }, { "id": "p2.24", "order": 33, "type": "footer", "bbox": { "l": 362.7003, "t": 27.2501, "r": 406.0014, "b": 18.8992 }, "text": "3/15/02, 2:24 PM", "attrs": { "block_label": "footer" }, "reading_order": 23 } ] }, { "document_id": 15928, "page": 3, "width": 603, "height": 783, "rotation": 0, "pipeline_version": "paddleocr-vl-1.6+paul-48", "width_pt": 603, "height_pt": 783, "engine": "paddleocr_vl", "source_run_id": 16039, "item_count": 206, "counts_by_type": { "caption": 1, "figure": 3, "footer": 5, "footnote": 4, "formula": 4, "header": 1, "heading": 1, "table": 2, "table_cell": 168, "text": 17 }, "build_ms": 97, "items": [ { "id": "p3.1", "order": 1, "type": "figure", "bbox": { "l": 47.1596, "t": 777.7258, "r": 558.8415, "b": 760.1451 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image", "embedded_text": "Water Water holding Electrical Cation exchange" }, "reading_order": 0 }, { "id": "p3.2", "order": 2, "type": "figure", "bbox": { "l": 419.2919, "t": 775.748, "r": 559.0558, "b": 761.9032 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image", "embedded_text": "Electrical Cation exchange" }, "reading_order": 1 }, { "id": "p3.3", "order": 3, "type": "figure", "bbox": { "l": 45.2304, "t": 775.3084, "r": 183.4938, "b": 761.6834 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image" }, "reading_order": 2 }, { "id": "p3.4", "order": 4, "type": "header", "bbox": { "l": 78.4565, "t": 718.391, "r": 374.9189, "b": 708.7216 }, "text": "Table 1. Properties of substrates tested for growing pawpaw seedlings in containers in the greenhouse.", "attrs": { "block_label": "figure_title" }, "level": 2, "reading_order": 3 }, { "id": "p3.5", "order": 5, "type": "table", "bbox": { "l": 78.0277, "t": 723.6102, "r": 536.1191, "b": 642.794 }, "text": "", "attrs": { "block_label": "table", "n_rows": 5, "n_cols": 8, "integrity": { "cells_checked": 40, "cells_flagged": 26, "flags": [ { "row": 0, "col": 0, "coverage": 0, "text": "Media" }, { "row": 0, "col": 1, "coverage": 0, "text": "Density ( g · L⁻¹)" }, { "row": 0, "col": 2, "coverage": 0, "text": "pH" }, { "row": 0, "col": 3, "coverage": 0, "text": "Water held ( gH₂O · L⁻¹ medium)" }, { "row": 0, "col": 4, "coverage": 0, "text": "Water holding capacity (w/w %)" }, { "row": 0, "col": 5, "coverage": 0, "text": "Electrical conductivity ( dS · m⁻¹)" }, { "row": 0, "col": 6, "coverage": 0, "text": "Cation exchange capacity (meq· 100 g⁻¹)" }, { "row": 0, "col": 7, "coverage": 0, "text": "Cation exchange capacity per liter (meq· L⁻¹)" }, { "row": 1, "col": 0, "coverage": 0, "text": "ProMix" }, { "row": 1, "col": 1, "coverage": 0, "text": "135.1 c^{{z}}" }, { "row": 1, "col": 2, "coverage": 0, "text": "5.57 ab" }, { "row": 1, "col": 3, "coverage": 0, "text": "685 a" } ] } }, "children": [ { "id": "p3.5.1", "order": 6, "type": "table_cell", "bbox": { "l": 78.0277, "t": 705.645, "r": 135.2891, "b": 693.0748 }, "text": "Media", "attrs": { "row": 0, "col": 0, "rowspan": 1, "colspan": 1 }, "reading_order": 0 }, { "id": "p3.5.2", "order": 7, "type": "table_cell", "bbox": { "l": 135.2891, "t": 705.645, "r": 192.5505, "b": 693.0748 }, "text": "Density ( g · L⁻¹)", "attrs": { "row": 0, "col": 1, "rowspan": 1, "colspan": 1 }, "reading_order": 1 }, { "id": "p3.5.3", "order": 8, "type": "table_cell", "bbox": { "l": 192.5505, "t": 705.645, "r": 249.812, "b": 693.0748 }, "text": "pH", "attrs": { "row": 0, "col": 2, "rowspan": 1, "colspan": 1 }, "reading_order": 2 }, { "id": "p3.5.4", "order": 9, "type": "table_cell", "bbox": { "l": 249.812, "t": 705.645, "r": 307.0734, "b": 693.0748 }, "text": "Water held ( gH₂O · L⁻¹ medium)", "attrs": { "row": 0, "col": 3, "rowspan": 1, "colspan": 1 }, "reading_order": 3 }, { "id": "p3.5.5", "order": 10, "type": "table_cell", "bbox": { "l": 307.0734, "t": 705.645, "r": 364.3348, "b": 693.0748 }, "text": "Water holding capacity (w/w %)", "attrs": { "row": 0, "col": 4, "rowspan": 1, "colspan": 1 }, "reading_order": 4 }, { "id": "p3.5.6", "order": 11, "type": "table_cell", "bbox": { "l": 364.3348, "t": 705.645, "r": 421.5962, "b": 693.0748 }, "text": "Electrical conductivity ( dS · m⁻¹)", "attrs": { "row": 0, "col": 5, "rowspan": 1, "colspan": 1 }, "reading_order": 5 }, { "id": "p3.5.7", "order": 12, "type": "table_cell", "bbox": { "l": 421.5962, "t": 705.645, "r": 478.8577, "b": 693.0748 }, "text": "Cation exchange capacity (meq· 100 g⁻¹)", "attrs": { "row": 0, "col": 6, "rowspan": 1, "colspan": 1 }, "reading_order": 6 }, { "id": "p3.5.8", "order": 13, "type": "table_cell", "bbox": { "l": 478.8577, "t": 705.645, "r": 536.1191, "b": 693.0748 }, "text": "Cation exchange capacity per liter (meq· L⁻¹)", "attrs": { "row": 0, "col": 7, "rowspan": 1, "colspan": 1 }, "reading_order": 7 }, { "id": "p3.5.9", "order": 14, "type": "table_cell", "bbox": { "l": 78.0277, "t": 693.0748, "r": 135.2891, "b": 680.5046 }, "text": "ProMix", "attrs": { "row": 1, "col": 0, "rowspan": 1, "colspan": 1 }, "reading_order": 8 }, { "id": "p3.5.10", "order": 15, "type": "table_cell", "bbox": { "l": 135.2891, "t": 693.0748, "r": 192.5505, "b": 680.5046 }, "text": "135.1 c^{{z}}", "attrs": { "row": 1, "col": 1, "rowspan": 1, "colspan": 1 }, "reading_order": 9 }, { "id": "p3.5.11", "order": 16, "type": "table_cell", "bbox": { "l": 192.5505, "t": 693.0748, "r": 249.812, "b": 680.5046 }, "text": "5.57 ab", "attrs": { "row": 1, "col": 2, "rowspan": 1, "colspan": 1 }, "reading_order": 10 }, { "id": "p3.5.12", "order": 17, "type": "table_cell", "bbox": { "l": 249.812, "t": 693.0748, "r": 307.0734, "b": 680.5046 }, "text": "685 a", "attrs": { "row": 1, "col": 3, "rowspan": 1, "colspan": 1 }, "reading_order": 11 }, { "id": "p3.5.13", "order": 18, "type": "table_cell", "bbox": { "l": 307.0734, "t": 693.0748, "r": 364.3348, "b": 680.5046 }, "text": "508 ± 10", "attrs": { "row": 1, "col": 4, "rowspan": 1, "colspan": 1 }, "reading_order": 12 }, { "id": "p3.5.14", "order": 19, "type": "table_cell", "bbox": { "l": 364.3348, "t": 693.0748, "r": 421.5962, "b": 680.5046 }, "text": "1.01 a", "attrs": { "row": 1, "col": 5, "rowspan": 1, "colspan": 1 }, "reading_order": 13 }, { "id": "p3.5.15", "order": 20, "type": "table_cell", "bbox": { "l": 421.5962, "t": 693.0748, "r": 478.8577, "b": 680.5046 }, "text": "195 a", "attrs": { "row": 1, "col": 6, "rowspan": 1, "colspan": 1 }, "reading_order": 14 }, { "id": "p3.5.16", "order": 21, "type": "table_cell", "bbox": { "l": 478.8577, "t": 693.0748, "r": 536.1191, "b": 680.5046 }, "text": "264 a", "attrs": { "row": 1, "col": 7, "rowspan": 1, "colspan": 1 }, "reading_order": 15 }, { "id": "p3.5.17", "order": 22, "type": "table_cell", "bbox": { "l": 78.0277, "t": 680.5046, "r": 135.2891, "b": 667.9344 }, "text": "Pine bark : sand (6:1)", "attrs": { "row": 2, "col": 0, "rowspan": 1, "colspan": 1 }, "reading_order": 16 }, { "id": "p3.5.18", "order": 23, "type": "table_cell", "bbox": { "l": 135.2891, "t": 680.5046, "r": 192.5505, "b": 667.9344 }, "text": "336.9 bc", "attrs": { "row": 2, "col": 1, "rowspan": 1, "colspan": 1 }, "reading_order": 17 }, { "id": "p3.5.19", "order": 24, "type": "table_cell", "bbox": { "l": 192.5505, "t": 680.5046, "r": 249.812, "b": 667.9344 }, "text": "5.07 c", "attrs": { "row": 2, "col": 2, "rowspan": 1, "colspan": 1 }, "reading_order": 18 }, { "id": "p3.5.20", "order": 25, "type": "table_cell", "bbox": { "l": 249.812, "t": 680.5046, "r": 307.0734, "b": 667.9344 }, "text": "203 d", "attrs": { "row": 2, "col": 3, "rowspan": 1, "colspan": 1 }, "reading_order": 19 }, { "id": "p3.5.21", "order": 26, "type": "table_cell", "bbox": { "l": 307.0734, "t": 680.5046, "r": 364.3348, "b": 667.9344 }, "text": "68 ± 10", "attrs": { "row": 2, "col": 4, "rowspan": 1, "colspan": 1 }, "reading_order": 20 }, { "id": "p3.5.22", "order": 27, "type": "table_cell", "bbox": { "l": 364.3348, "t": 680.5046, "r": 421.5962, "b": 667.9344 }, "text": "0.58 b", "attrs": { "row": 2, "col": 5, "rowspan": 1, "colspan": 1 }, "reading_order": 21 }, { "id": "p3.5.23", "order": 28, "type": "table_cell", "bbox": { "l": 421.5962, "t": 680.5046, "r": 478.8577, "b": 667.9344 }, "text": "17 b", "attrs": { "row": 2, "col": 6, "rowspan": 1, "colspan": 1 }, "reading_order": 22 }, { "id": "p3.5.24", "order": 29, "type": "table_cell", "bbox": { "l": 478.8577, "t": 680.5046, "r": 536.1191, "b": 667.9344 }, "text": "58 c", "attrs": { "row": 2, "col": 7, "rowspan": 1, "colspan": 1 }, "reading_order": 23 }, { "id": "p3.5.25", "order": 30, "type": "table_cell", "bbox": { "l": 90, "t": 721.4742, "r": 177.9984, "b": 714.2742000000001 }, "text": "Sand : sphagnum peat (1:1)", "attrs": { "row": 3, "col": 0, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 24 }, { "id": "p3.5.26", "order": 31, "type": "table_cell", "bbox": { "l": 224.9768, "t": 721.4742, "r": 248.5304, "b": 714.2742000000001 }, "text": "996.8 a", "attrs": { "row": 3, "col": 1, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 25 }, { "id": "p3.5.27", "order": 32, "type": "table_cell", "bbox": { "l": 264.9936, "t": 721.4742, "r": 288.5472, "b": 714.2742000000001 }, "text": "5.31 bc", "attrs": { "row": 3, "col": 2, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 26 }, { "id": "p3.5.28", "order": 33, "type": "table_cell", "bbox": { "l": 325.9816, "t": 721.4742, "r": 343.9832, "b": 714.2742000000001 }, "text": "501 b", "attrs": { "row": 3, "col": 3, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 27 }, { "id": "p3.5.29", "order": 34, "type": "table_cell", "bbox": { "l": 389.6096, "t": 723.6102, "r": 409.9936, "b": 713.2102 }, "text": "50 ± 1", "attrs": { "row": 3, "col": 4, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 28 }, { "id": "p3.5.30", "order": 35, "type": "table_cell", "bbox": { "l": 444.0032, "t": 721.4742, "r": 463.5552, "b": 714.2742000000001 }, "text": "0.23 c", "attrs": { "row": 3, "col": 5, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 29 }, { "id": "p3.5.31", "order": 36, "type": "table_cell", "bbox": { "l": 501.9848, "t": 721.4742, "r": 515.9848, "b": 714.2742000000001 }, "text": "10 b", "attrs": { "row": 3, "col": 6, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 30 }, { "id": "p3.5.32", "order": 37, "type": "table_cell", "bbox": { "l": 478.8577, "t": 667.9344, "r": 536.1191, "b": 655.3642 }, "text": "103 b", "attrs": { "row": 3, "col": 7, "rowspan": 1, "colspan": 1 }, "reading_order": 31 }, { "id": "p3.5.33", "order": 38, "type": "table_cell", "bbox": { "l": 90, "t": 712.4598, "r": 215.552, "b": 705.2598 }, "text": "Pine bark : sand:sphagnum peat (4:1:1)", "attrs": { "row": 4, "col": 0, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 32 }, { "id": "p3.5.34", "order": 39, "type": "table_cell", "bbox": { "l": 224.9752, "t": 712.4598, "r": 248.9768, "b": 705.2598 }, "text": "566.2 b", "attrs": { "row": 4, "col": 1, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 33 }, { "id": "p3.5.35", "order": 40, "type": "table_cell", "bbox": { "l": 264.9912, "t": 712.4598, "r": 284.5448, "b": 705.2598 }, "text": "5.80 a", "attrs": { "row": 4, "col": 2, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 34 }, { "id": "p3.5.36", "order": 41, "type": "table_cell", "bbox": { "l": 325.9792, "t": 712.4598, "r": 343.5328, "b": 705.2598 }, "text": "405 c", "attrs": { "row": 4, "col": 3, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 35 }, { "id": "p3.5.37", "order": 42, "type": "table_cell", "bbox": { "l": 389.608, "t": 714.5958, "r": 409.9936, "b": 704.1958 }, "text": "72 ± 3", "attrs": { "row": 4, "col": 4, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 36 }, { "id": "p3.5.38", "order": 43, "type": "table_cell", "bbox": { "l": 444.0032, "t": 712.4598, "r": 463.5552, "b": 705.2598 }, "text": "0.24 c", "attrs": { "row": 4, "col": 5, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 37 }, { "id": "p3.5.39", "order": 44, "type": "table_cell", "bbox": { "l": 501.9848, "t": 712.4598, "r": 515.9848, "b": 705.2598 }, "text": "23 b", "attrs": { "row": 4, "col": 6, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 38 }, { "id": "p3.5.40", "order": 45, "type": "table_cell", "bbox": { "l": 478.8577, "t": 655.3642, "r": 536.1191, "b": 642.794 }, "text": "129 b", "attrs": { "row": 4, "col": 7, "rowspan": 1, "colspan": 1 }, "reading_order": 39 } ], "reading_order": 4 }, { "id": "p3.6", "order": 46, "type": "text", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "tration was[p3.6.1],[p3.6.2],[p3.6.3],[p3.6.4] mg·L[p3.6.5], for ProMix, 1 sand : 1 sphagnum peat, 4 pine bark : 1 sand : 1 sphagnum peat, and 6 pine bark : 1 sand (v/v) substrates, receptively. The germination percentage was[p3.6.6], and no significant differences in this rate were detected among the four media (data not shown).", "children": [ { "id": "p3.6.1", "order": 47, "type": "formula", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "112 \\pm 1, 71 \\pm 10, 16 \\pm 2, 21 \\pm 1\\ \\text{mg}\\cdot\\text{L}^{-1}", "attrs": { "latex": "112 \\pm 1, 71 \\pm 10, 16 \\pm 2, 21 \\pm 1\\ \\text{mg}\\cdot\\text{L}^{-1}", "inline": true, "text_offset": 11, "text_span": 8, "bbox_estimated": true, "alt": "112 plus or minus 1, 71 plus or minus 10, 16 plus or minus 2, 21 plus or minus 1 mg times L to the power of minus 1", "notation": "latex", "mathml": "112±1,71±10,16±2,21±1 mg·L−1" }, "reading_order": 0 }, { "id": "p3.6.2", "order": 48, "type": "formula", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "71 ± 10", "attrs": { "latex": "71 \\pm 10", "inline": true, "text_offset": 20, "text_span": 8, "bbox_estimated": true, "alt": "71 plus or minus 10", "mathml": "71±10" }, "reading_order": 1 }, { "id": "p3.6.3", "order": 49, "type": "text", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "16 ± 2", "attrs": { "inline": true, "text_offset": 29, "text_span": 8, "bbox_estimated": true }, "reading_order": 2 }, { "id": "p3.6.4", "order": 50, "type": "formula", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "\\text{tration was } 112 \\pm 1, 71 \\pm 10, 16 \\pm 2, 21 \\pm 1\\ \\text{mg}\\cdot\\text{L}^{-1}\\text{, for ProMix, 1 sand : 1 sphagnum peat, 4 pine bark : 1 sand : 1 sphagnum peat, and 6 pine bark : 1 sand (v/v) substrates, receptively. The germination percentage was} \\approx 80\\%\\text{, and no significant differences in this rate were detected among the four media (data not shown).} \\text{Analysis of variance indicated that there}", "attrs": { "latex": "\\text{tration was } 112 \\pm 1, 71 \\pm 10, 16 \\pm 2, 21 \\pm 1\\ \\text{mg}\\cdot\\text{L}^{-1}\\text{, for ProMix, 1 sand : 1 sphagnum peat, 4 pine bark : 1 sand : 1 sphagnum peat, and 6 pine bark : 1 sand (v/v) substrates, receptively. The germination percentage was} \\approx 80\\%\\text{, and no significant differences in this rate were detected among the four media (data not shown).} \\text{Analysis of variance indicated that there}", "inline": true, "text_offset": 38, "text_span": 8, "bbox_estimated": true, "alt": "tration was 112 plus or minus 1, 71 plus or minus 10, 16 plus or minus 2, 21 plus or minus 1 mg times L to the power of minus 1, for ProMix, 1 sand : 1 sphagnum peat, 4 pine bark : 1 sand : 1 sphagnum peat, and 6 pine bark : 1 sand of v over v substrates, receptively. The germination percentage was is approximately 80 %, and no significant differences in this rate were detected among the four media of data not shown . Analysis of variance indicated that there", "notation": "latex", "mathml": "tration was 112±1,71±10,16±2,21±1 mg·L−1, for ProMix, 1 sand : 1 sphagnum peat, 4 pine bark : 1 sand : 1 sphagnum peat, and 6 pine bark : 1 sand (v/v) substrates, receptively. The germination percentage was≈80%, and no significant differences in this rate were detected among the four media (data not shown).Analysis of variance indicated that there" }, "reading_order": 3 }, { "id": "p3.6.5", "order": 51, "type": "text", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 51, "text_span": 8, "bbox_estimated": true }, "reading_order": 4 }, { "id": "p3.6.6", "order": 52, "type": "formula", "bbox": { "l": 77.599, "t": 620.3786, "r": 226.5805, "b": 546.1002 }, "text": "\\approx 80\\%", "attrs": { "latex": "\\approx 80\\%", "inline": true, "text_offset": 225, "text_span": 8, "bbox_estimated": true, "notation": "latex", "alt": "is approximately 80 %", "mathml": "≈80%" }, "reading_order": 5 } ], "reading_order": 5 }, { "id": "p3.7", "order": 53, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "Analysis of variance indicated that there was a significant interaction between the main effects of potting substrate and fertilizer regime ( $ P < 0.001 $) for shoot and total plant dry weight, but not for root dry weight (Table 2). The 100 mg·L[p3.7.1] N fertilizer level significantly increased pawpaw seedling leaf number, height, shoot dry weight, total plant dry weight, and decreased root : shoot ratio in ProMix and 1 sand : 1 sphagnum peat (Table 2). In the 100 mg·L[p3.7.2] N fertilizer treatment, seedling total dry weight production was significantly greater in ProMix than in 1 sand : 1 sphagnum peat (independent t test, $ P < 0.001 $; Table 2). Seedlings in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat stopped growing and set terminal buds[p3.7.3] d after fertilization treatments were imposed; however, seedlings did not display chlorosis in any substrate or fertilizer treatment. Root dry weight was significantly affected by medium type and fertilizer rate, and there was no interaction between the main effects. Root dry weight was similar in ProMix (2.3 g) and 1 sand : 1 sphagnum peat (2.1 g), and significantly (LSD, $ P < 0.05 $) greater in these media than in 6 pine bark : 1 sand (v/v) (1.3 g) and 4 pine bark : 1 sand : 1 sphagnum peat (1.6 g). Root dry weight was similar at 50 mg·L[p3.7.4] N (1.9 g) and 100 mg·L[p3.7.5] N (2.1 g) fertilization rates, but significantly (LSD, $ P < 0.05 $) less in non-fertigated seedlings (1.6 g).", "children": [ { "id": "p3.7.1", "order": 54, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 246, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p3.7.2", "order": 55, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 475, "text_span": 8, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p3.7.3", "order": 56, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "≈ 50", "attrs": { "inline": true, "text_offset": 780, "text_span": 8, "bbox_estimated": true }, "reading_order": 2 }, { "id": "p3.7.4", "order": 57, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 1335, "text_span": 8, "bbox_estimated": true }, "reading_order": 3 }, { "id": "p3.7.5", "order": 58, "type": "text", "bbox": { "l": 77.1703, "t": 546.1002, "r": 227.438, "b": 279.0935 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 1366, "text_span": 8, "bbox_estimated": true }, "reading_order": 4 } ], "reading_order": 6 }, { "id": "p3.8", "order": 59, "type": "text", "bbox": { "l": 232.797, "t": 620.1589, "r": 381.3498, "b": 591.3705 }, "text": "(1.9 g) and 100 mg·L[p3.8.1] N (2.1 g) fertigation rates, but significantly (LSD, P < 0.05) less in non-fertigated seedlings (1.6 g).", "children": [ { "id": "p3.8.1", "order": 60, "type": "text", "bbox": { "l": 232.797, "t": 620.1589, "r": 381.3498, "b": 591.3705 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 20, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 7 }, { "id": "p3.9", "order": 61, "type": "text", "bbox": { "l": 232.5827, "t": 591.5902, "r": 381.7785, "b": 446.11 }, "text": "Expt. 2, root-zone heating study. Increasing the root-zone temperature from 24 to 32 °C by bottom heating significantly (independent t test, P < 0.001) hastened seedling emergence from the soil by 9 d. Seedlings reached the 2 to 3 leaf stage at 69 d after sowing with bottom-heat, but did not reach this stage in ambient plants until 79 d after sowing (Fig. 1A). Seedling leaf number increased steadily in both ambient and bottom-heated plants until harvest (Fig. 1A). Average seedling height of [p3.9.1]10 cm was not achieved by ambient plants until 79 d after sowing, whereas seedlings with bottom heat reached this height 69 d after sowing (Fig. 1B).", "children": [ { "id": "p3.9.1", "order": 62, "type": "text", "bbox": { "l": 232.5827, "t": 591.5902, "r": 381.7785, "b": 446.11 }, "text": "≈", "attrs": { "inline": true, "text_offset": 496, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 8 }, { "id": "p3.10", "order": 63, "type": "text", "bbox": { "l": 232.3683, "t": 445.4507, "r": 381.9929, "b": 278.8737 }, "text": "Bottom heat increased all growth characteristics that were measured after harvest, except root: shoot ratio (Table 3). Bottom-heated seedlings had a significant increase in the following parameters relative to ambient plants: leaf number (30%), plant height (32%), whole plant leaf area (94%), shoot dry weight (104%), total root dry weight (50%), lateral root dry weight (125%), and total plant dry weight (87%; Table 3). Bottom-heated seedlings showed a decrease in root: shoot ratio of 25% and in SLW of 16% compared to ambient plants. Seedlings subjected to bottom heat had an increase in leaf chl concentration for chl a (39%), chl b (33%), chl p (43%), total chl (38%), and chl a : b ratio (8%) when compared to ambient seedlings (Table 3).", "reading_order": 9 }, { "id": "p3.11", "order": 64, "type": "heading", "bbox": { "l": 442.8717, "t": 619.9391, "r": 482.5286, "b": 610.05 }, "text": "Discussion", "attrs": { "block_label": "paragraph_title" }, "level": 3, "reading_order": 10 }, { "id": "p3.12", "order": 65, "type": "text", "bbox": { "l": 387.3519, "t": 603.4572, "r": 537.4053, "b": 281.0713 }, "text": "Growth characteristics of pawpaw seedlings in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat were poor compared to plants in ProMix or 1 sand : 1 sphagnum peat. Mandujano and Fulbright (1998) reported that pawpaw seedlings in containers grew well and appeared very healthy in the pH range of 5.0 to 5.6, but at pH 5.7–6.0 they observed some leaf curling and tip burn. The pH range of substrate in this study was between 5.07 and 5.80 at the start of the experiment. Although the substrate pH may have changed during the experiment, differences in seedling growth response to the substrate used were not likely due to the differences in substrate pH. 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat tended to dry out quickly. Even though plants were watered daily, the lower water holding capacity of the pine bark may have reduced growth of plants in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat. Wilting of plants was not observed in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat, but plants in these substrates stopped growing and set terminal buds about halfway through the experiment, indicating that the plants experienced stress. Plants in the pine bark substrate may also have been stressed due to reduced nutrient availability; however, all plants appeared healthy at the end of the experiment. Cation exchange capacity for substrate mixtures used in container production of plants should be reported on a volume basis, due to the light weight of some media, and", "reading_order": 11 }, { "id": "p3.13", "order": 66, "type": "caption", "bbox": { "l": 108.2528, "t": 268.1055, "r": 513.3967, "b": 250.5248 }, "text": "Table 2. Growth characteristics of pawpaw seedlings grown in a greenhouse with four growing substrates 70 d after fertilizer application and 140 d after sowing.", "attrs": { "block_label": "figure_title" }, "reading_order": 12 }, { "id": "p3.14", "order": 67, "type": "table", "bbox": { "l": 106.7522, "t": 266.37199999999996, "r": 515.0169, "b": 86.8047 }, "text": "", "attrs": { "block_label": "table", "n_rows": 17, "n_cols": 8, "integrity": { "cells_checked": 101, "cells_flagged": 14, "flags": [ { "row": 0, "col": 7, "coverage": 0, "text": "Root : shoot ratio" }, { "row": 1, "col": 2, "coverage": 0, "text": "6.1 cz" }, { "row": 1, "col": 7, "coverage": 0, "text": "2.81 a" }, { "row": 2, "col": 6, "coverage": 0, "text": "1.89 b" }, { "row": 3, "col": 6, "coverage": 0, "text": "1.46 c" }, { "row": 4, "col": 7, "coverage": 0, "text": "2.59 b" }, { "row": 5, "col": 6, "coverage": 0, "text": "2.94 ab" }, { "row": 6, "col": 6, "coverage": 0, "text": "3.29 a" }, { "row": 7, "col": 7, "coverage": 0.5, "text": "2.65 a" }, { "row": 8, "col": 6, "coverage": 0, "text": "2.65 a" }, { "row": 9, "col": 6, "coverage": 0, "text": "1.71 b" }, { "row": 10, "col": 7, "coverage": 0.5, "text": "3.19 a" } ] } }, "children": [ { "id": "p3.14.1", "order": 68, "type": "table_cell", "bbox": { "l": 124.2992, "t": 257.3578, "r": 144.7456, "b": 250.15779999999995 }, "text": "Media", "attrs": { "row": 0, "col": 0, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 0 }, { "id": "p3.14.2", "order": 69, "type": "table_cell", "bbox": { "l": 238.3089, "t": 266.37199999999996, "r": 274.2945, "b": 259.172 }, "text": "N as Peters mg · L⁻¹", "attrs": { "row": 0, "col": 1, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 1 }, { "id": "p3.14.3", "order": 70, "type": "table_cell", "bbox": { "l": 293.0313, "t": 266.37199999999996, "r": 313.4681, "b": 250.15779999999995 }, "text": "No. of leaves", "attrs": { "row": 0, "col": 2, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 2 }, { "id": "p3.14.4", "order": 71, "type": "table_cell", "bbox": { "l": 334.3769, "t": 266.37199999999996, "r": 356.1489, "b": 250.15779999999995 }, "text": "Height (cm)", "attrs": { "row": 0, "col": 3, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 3 }, { "id": "p3.14.5", "order": 72, "type": "table_cell", "bbox": { "l": 369.1777, "t": 266.37199999999996, "r": 407.3953, "b": 250.15779999999995 }, "text": "Root dry wt (g)", "attrs": { "row": 0, "col": 4, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 4 }, { "id": "p3.14.6", "order": 73, "type": "table_cell", "bbox": { "l": 421.6065, "t": 266.37199999999996, "r": 462.9353, "b": 250.15779999999995 }, "text": "Shoot dry wt (g)", "attrs": { "row": 0, "col": 5, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 5 }, { "id": "p3.14.7", "order": 74, "type": "table_cell", "bbox": { "l": 475.4721, "t": 266.37199999999996, "r": 515.0169, "b": 250.15779999999995 }, "text": "Total dry wt (g)", "attrs": { "row": 0, "col": 6, "rowspan": 1, "colspan": 1, "bbox_refit": true, "column_header": true, "header_source": "heuristic" }, "reading_order": 6 }, { "id": "p3.14.8", "order": 75, "type": "table_cell", "bbox": { "l": 460.5029, "t": 247.2285, "r": 511.0387, "b": 237.7918 }, "text": "Root : shoot ratio", "attrs": { "row": 0, "col": 7, "rowspan": 1, "colspan": 1, "column_header": true, "header_source": "heuristic" }, "reading_order": 7 }, { "id": "p3.14.9", "order": 76, "type": "table_cell", "bbox": { "l": 124.2991, "t": 247.38019999999995, "r": 148.7471, "b": 240.1802 }, "text": "ProMix", "attrs": { "row": 1, "col": 0, "rowspan": 3, "colspan": 1, "bbox_refit": true }, "reading_order": 8 }, { "id": "p3.14.10", "order": 77, "type": "table_cell", "bbox": { "l": 258.2919, "t": 247.38019999999995, "r": 262.2919, "b": 240.1802 }, "text": "0", "attrs": { "row": 1, "col": 1, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 9 }, { "id": "p3.14.11", "order": 78, "type": "table_cell", "bbox": { "l": 207.8238, "t": 237.7918, "r": 258.3596, "b": 228.3551 }, "text": "6.1 cz", "attrs": { "row": 1, "col": 2, "rowspan": 1, "colspan": 1 }, "reading_order": 10 }, { "id": "p3.14.12", "order": 79, "type": "table_cell", "bbox": { "l": 338.3023, "t": 247.37980000000005, "r": 353.8543, "b": 240.1798 }, "text": "9.1 c", "attrs": { "row": 1, "col": 3, "rowspan": 1, "colspan": 1, "bbox_refit": true }, "reading_order": 11 }, { "id": "p3.14.13", "order": 80, "type": "table_cell", "bbox": { "l": 381.2887, "t": 247.37980000000005, "r": 395.2887, "b": 240.1798 }, "text": "1.85", "attrs": { "row": 1, "col": 4, "rowspan": 1, "colspan": 1, 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Mean[p3.16.1] SE", "attrs": { "block_label": "vision_footnote" }, "children": [ { "id": "p3.16.1", "order": 198, "type": "text", "bbox": { "l": 78.2421, "t": 643.4533, "r": 333.7615, "b": 633.7839 }, "text": "±", "attrs": { "inline": true, "text_offset": 82, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 15 }, { "id": "p3.17", "order": 199, "type": "footnote", "bbox": { "l": 109.1102, "t": 85.7059, "r": 314.2545, "b": 76.9155 }, "text": "[p3.17.1]Mean separation within substrate and fertilizer level by LSD, P < 0.05.", "attrs": { "block_label": "vision_footnote" }, "children": [ { "id": "p3.17.1", "order": 200, "type": "text", "bbox": { "l": 109.1102, "t": 85.7059, "r": 314.2545, "b": 76.9155 }, "text": "²", "attrs": { "inline": true, "text_offset": 0, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 16 }, { "id": "p3.18", "order": 201, "type": "footnote", "bbox": { "l": 108.6815, "t": 77.1353, "r": 345.7657, "b": 67.9054 }, "text": "NS, *, **, ***\nNonsignificant or significant at P < 0.01, 0.001, and 0.0001, respectively.", "attrs": { "block_label": "vision_footnote" }, "reading_order": 17 }, { "id": "p3.19", "order": 202, "type": "footnote", "bbox": { "l": 78.0277, "t": 59.7743, "r": 216.2911, "b": 48.3469 }, "text": "HORTSCIENCE, Vol. 37(2), APRIL 2002", "attrs": { "block_label": "vision_footnote" }, "reading_order": 18 }, { "id": "p3.20", "order": 203, "type": "footer", "bbox": { "l": 43.0867, "t": 26.5908, "r": 86.6022, "b": 18.4597 }, "text": "6807, p. 329-333", "attrs": { "block_label": "footer" }, "reading_order": 19 }, { "id": "p3.21", "order": 204, "type": "footer", "bbox": { "l": 155.8411, "t": 26.1513, "r": 166.7736, "b": 18.8992 }, "text": "331", "attrs": { "block_label": "number" }, "reading_order": 20 }, { "id": "p3.22", "order": 205, "type": "footer", "bbox": { "l": 296.2481, "t": 22.4154, "r": 306.3231, "b": 11.2077 }, "text": "", "attrs": { "block_label": "footer_image" }, "reading_order": 21 }, { "id": "p3.23", "order": 206, "type": "footer", "bbox": { "l": 362.486, "t": 26.8106, "r": 406.0014, "b": 18.8992 }, "text": "3/15/02, 2:24 PM", "attrs": { "block_label": "footer" }, "reading_order": 22 } ] }, { "document_id": 15928, "page": 4, "width": 603, "height": 783, "rotation": 0, "pipeline_version": "paddleocr-vl-1.6+paul-48", "width_pt": 603, "height_pt": 783, "engine": "paddleocr_vl", "source_run_id": 16039, "item_count": 58, "counts_by_type": { "caption": 2, "figure": 2, "footer": 6, "formula": 1, "header": 3, "table": 1, "table_cell": 32, "text": 11 }, "build_ms": 23, "items": [ { "id": "p4.1", "order": 1, "type": "header", "bbox": { "l": 45.016, "t": 775.3084, "r": 183.2794, "b": 761.6834 }, "text": "📚 📚 📚 📚", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 0 }, { "id": "p4.2", "order": 2, "type": "figure", "bbox": { "l": 295.8194, "t": 772.8911, "r": 306.9662, "b": 760.5846 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image" }, "reading_order": 1 }, { "id": "p4.3", "order": 3, "type": "header", "bbox": { "l": 419.7206, "t": 775.9677, "r": 558.8415, "b": 761.9032 }, "text": "□ □ □ □", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 2 }, { "id": "p4.4", "order": 4, "type": "header", "bbox": { "l": 207.5023, "t": 738.6088, "r": 382.2073, "b": 727.6208 }, "text": "SOIL MANAGEMENT, FERTILIZATION, & IRRIGATION", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 3 }, { "id": "p4.5", "order": 5, "type": "figure", "bbox": { "l": 86.8166, "t": 717.7317, "r": 340.8354, "b": 387.2147 }, "text": "", "attrs": { "kind": "chart", "block_label": "chart", "embedded_text": "1. Response of pawpaw [Asimina triloba (L.) Dunal] seedlings to an ambient\n24 °C (○) and bottom heating at 32 °C (●) for seedling leaf number for (A) fully" }, "reading_order": 4 }, { "id": "p4.6", "order": 6, "type": "caption", "bbox": { "l": 70.0963, "t": 373.5897, "r": 368.7025, "b": 350.0755 }, "text": "Fig. 1. Response of pawpaw [Asimina triloba (L.) Dunal] seedlings to an ambient root-zone temperature at 24 °C (O) and bottom heating at 32 °C (●) for seedling leaf number for (A) fully expanded leaves and (B) height after seedlings had emerged from the growing substrate. Mean ± se, n = 3.", "attrs": { "block_label": "figure_title" }, "reading_order": 5 }, { "id": "p4.7", "order": 7, "type": "text", "bbox": { "l": 65.166, "t": 336.6702, "r": 214.3619, "b": 234.4825 }, "text": "because the amount of soil is determined by the volume of the container. On a volume basis, CEC of ProMix was greater than other media. Interestingly, the CEC values of 1 sand : 1 sphagnum peat and 4 pine bark : 1 sand : 1 sphagnum peat substrate were similar, suggesting that the lower water holding capacity of 4 pine bark : 1 sand : 1 sphagnum peat resulted in the reduced seedling growth in this substrate. With daily watering, it is also likely that the nutrients (applied weekly) were leached more rapidly from the 6 pine bark : 1 sand (v/v), 1 sand : 1 sphagnum peat, and 4 pine bark : 1 sand : 1 sphagnum peat substrate, resulting in greater plant growth in ProMix. As the pine bark decomposed in containers during the experiment, some applied nutrients may have been used by microorganisms. If seedlings in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat were irrigated and fertilized more frequently, growth of seedlings in these substrates might have been en-", "reading_order": 6 }, { "id": "p4.8", "order": 8, "type": "text", "bbox": { "l": 220.1497, "t": 336.6702, "r": 368.9168, "b": 234.7022 }, "text": "more rapidly from the 6 pine bark : 1 sand (v/v), 1 sand : 1 sphagnum peat, and 4 pine bark : 1 sand : 1 sphagnum peat substrate, resulting in greater plant growth in ProMix. As the pine bark decomposed in containers during the experiment, some applied nutrients may have been used by microorganisms. If seedlings in 6 pine bark : 1 sand (v/v) and 4 pine bark : 1 sand : 1 sphagnum peat were irrigated and fertilized more frequently, growth of seedlings in these substrates might have been en-", "reading_order": 7 }, { "id": "p4.9", "order": 9, "type": "caption", "bbox": { "l": 69.0245, "t": 227.8897, "r": 367.2019, "b": 209.6497 }, "text": "Table 3. Influence of bottom heating on growth characteristics and leaf chlorophyll (Chl) concentration on greenhouse grown pawpaw seedlings 114 days after sowing.", "attrs": { "block_label": "figure_title" }, "reading_order": 8 }, { "id": "p4.10", "order": 10, "type": "table", "bbox": { "l": 68.8102, "t": 222.46339999999998, "r": 408.4002, "b": 71.2018 }, "text": "", "attrs": { "block_label": "table", "n_rows": 8, "n_cols": 4, "integrity": { "cells_checked": 31, "cells_flagged": 4, "flags": [ { "row": 3, "col": 0, "coverage": 0.2, "text": "Chl a ( $ g \\cdot m^{{-2}} $)" }, { "row": 4, "col": 0, "coverage": 0.2, "text": "Chl b ( $ g \\cdot m^{{-2}} $)" }, { "row": 5, "col": 0, "coverage": 0.2, "text": "Chl p ( $ g \\cdot m^{{-2}} $)" }, { "row": 6, "col": 0, "coverage": 0.2, "text": "Total chl ( $ g \\cdot m^{{-2}} $)" } ] } }, "children": [ { "id": "p4.10.1", "order": 11, "type": "table_cell", "bbox": { "l": 68.8102, "t": 206.1336, "r": 142.9794, "b": 197.1381 }, "text": "", "attrs": { "row": 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true, "column_header": true, "header_source": "heuristic" }, "reading_order": 3 }, { "id": "p4.10.5", "order": 15, "type": "table_cell", "bbox": { "l": 80.008, "t": 203.47109999999998, "r": 135.552, "b": 187.25670000000002 }, "text": "Leaf number\nPlant height (cm)", "attrs": { "row": 1, "col": 0, "rowspan": 1, "colspan": 1, "bbox_refit": true, "merged_continuation": true }, "reading_order": 4 }, { "id": "p4.10.6", "order": 16, "type": "table_cell", "bbox": { "l": 218.976, "t": 203.47109999999998, "r": 232.9736, "b": 187.25670000000002 }, "text": "9.4\n15.7", "attrs": { "row": 1, "col": 1, "rowspan": 1, "colspan": 1, "bbox_refit": true, "merged_continuation": true }, "reading_order": 5 }, { "id": "p4.10.7", "order": 17, "type": "table_cell", "bbox": { "l": 285.9928, "t": 203.47109999999998, "r": 300.992, "b": 187.25670000000002 }, "text": "12.3\n20.8", "attrs": { "row": 1, "col": 2, "rowspan": 1, "colspan": 1, "bbox_refit": true, "merged_continuation": true }, "reading_order": 6 }, { "id": "p4.10.8", "order": 18, "type": "table_cell", "bbox": { "l": 368.7272, "t": 203.47109999999998, "r": 391.2416, "b": 187.25670000000002 }, "text": "<0.001\n<0.002", "attrs": { "row": 1, "col": 3, "rowspan": 1, "colspan": 1, "bbox_refit": true, "merged_continuation": true }, "reading_order": 7 }, { "id": "p4.10.9", "order": 19, "type": "table_cell", "bbox": { "l": 80.0079, "t": 185.47109999999998, "r": 180.4351, "b": 124.27139999999997 }, "text": "Whole plant leaf area ( cm^{{2}})\nSpecific leaf dry weight (SLW; g· m^{{-2}})\nShoot dry weight (g)\nTotal root dry weight (g)\nLateral root dry weight (g)\nTotal plant dry weight (g)\nRoot:shoot ratio", "attrs": { "row": 2, "col": 0, "rowspan": 1, "colspan": 1, "bbox_refit": true, "merged_continuation": true }, "reading_order": 8 }, { "id": "p4.10.10", "order": 20, "type": "table_cell", "bbox": { "l": 218.9682, "t": 185.47119999999995, "r": 232.9914, "b": 124.27139999999997 }, "text": "305\n0.24\n1.10\n0.48\n0.12\n1.58\n0.43", "attrs": 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"id": "p4.11", "order": 43, "type": "text", "bbox": { "l": 375.1333, "t": 718.391, "r": 524.7579, "b": 460.8338 }, "text": "hanced. However, extra labor required for the additional watering would not make these substrates attractive to small nurseries that do not have automated watering systems. A substrate that contains less pine bark and more sphagnum peat might also serve as a successful container substrate for production of paw-paw seedlings. ProMix contains dolomitic and calcitic limestone, and Ca concentration was almost 2-fold greater for ProMix than 1 sand: 1 sphagnum peat, and [p4.12.1]5-fold greater in 4 pine bark: 1 sand: 1 sphagnum peat, and 6 pine bark: 1 sand (v/v) substrates. The irrigation water used in this study contained Ca at 35 mg·L[p4.12.2]. It is possible that low Ca substrate levels may have limited plant growth in the 4 pine bark: 1 sand: 1 sphagnum peat, and 6 pine bark: 1 sand (v/v) substrates; however, Ca deficiency symptoms were not observed with plants on these substrates. Overall, ProMix with a once weekly application of 100 mg·L [p4.12.3]N as Peters water-soluble fertilizer served as an excellent substrate for the production of robust pawpaw seedlings for transplanting. Seedlings in the 1 sand: 1 sphagnum peat substrate preformed well, but the heavy weight of this medium would also make containers heavy and more cumbersome to handle.", "children": [ { "id": "p4.11.1", "order": 44, "type": "text", "bbox": { "l": 375.1333, "t": 718.391, "r": 524.7579, "b": 460.8338 }, "text": "≈", "attrs": { "inline": true, "text_offset": 469, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p4.11.2", "order": 45, "type": "text", "bbox": { "l": 375.1333, "t": 718.391, "r": 524.7579, "b": 460.8338 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 639, "text_span": 9, "bbox_estimated": true }, "reading_order": 1 }, { "id": "p4.11.3", "order": 46, "type": "text", "bbox": { "l": 375.1333, "t": 718.391, "r": 524.7579, "b": 460.8338 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 953, "text_span": 9, "bbox_estimated": true }, "reading_order": 2 } ], "reading_order": 10 }, { "id": "p4.12", "order": 47, "type": "text", "bbox": { "l": 375.562, "t": 461.0536, "r": 524.3292, "b": 323.7045 }, "text": "Pawpaw seedlings responded very favorably to root-zone warming to[p4.13.1] by increasing shoot, root, and total dry matter production. Seedling emergence from the substrate 9 d before their ambient substrate temperature counterparts gave seedlings with bottom heat a significant advantage in their development. The positive response of seedlings to bottom heat indicates that pawpaw is similar to other tree species, such as thornless honey locust (Klock et al., 1996), that tolerate elevated root-zone temperatures. Further research will be required to determine the optimum soil temperature for pawpaw seedling growth and development.", "children": [ { "id": "p4.12.1", "order": 48, "type": "text", "bbox": { "l": 375.562, "t": 461.0536, "r": 524.3292, "b": 323.7045 }, "text": "32 °C", "attrs": { "inline": true, "text_offset": 65, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 11 }, { "id": "p4.13", "order": 49, "type": "text", "bbox": { "l": 375.1333, "t": 323.7045, "r": 524.3292, "b": 86.8047 }, "text": "Elevated soil temperatures have been reported to significantly increase nutrient uptake and dry weight production in passionfruit (Menzel et al., 1994), and they have increased bloom yield and stem length for hydroponically grown roses (Moss, 1984). Elevated soil temperatures significantly increased nutrient uptake and dry weight gain in passionfruit (Menzel et al., 1994) and N accumulation by apple trees (Toselli et al., 1999). Lopez-Cantarero et al. (1994) reported that leaf chl levels were directly related to N and P fertilization levels in Solanum melongena L. Based on the significantly higher leaf chlorophyll levels, whole plant leaf area, and biomass accumulated for bottom-heated vs. ambient seedlings, it is likely that seedlings with bottom heat had a higher nutrient uptake and quantity and greater photosynthetic activity. The Peters 20N–8.6P–16.6K plus soluble trace elements used in this study contained 3.94% [p4.14.1]-N, 6.05% [p4.14.2]-N, and 10.01% urea-N; we did not include any other fertilizer formulations as treatments; therefore it is unclear if pawpaw prefers to utilize one N form over another.", "children": [ { "id": "p4.13.1", "order": 50, "type": "text", "bbox": { "l": 375.1333, "t": 323.7045, "r": 524.3292, "b": 86.8047 }, "text": "NH₄", "attrs": { "inline": true, "text_offset": 931, "text_span": 9, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p4.13.2", "order": 51, "type": "formula", "bbox": { "l": 375.1333, "t": 323.7045, "r": 524.3292, "b": 86.8047 }, "text": "\\text{6.05\\% NO}_{3}\\text{-N}", "attrs": { "latex": "\\text{6.05\\% NO}_{3}\\text{-N}", "inline": true, "text_offset": 950, "text_span": 9, "bbox_estimated": true, "alt": "6.05 % NO sub 3 minus N", "notation": "latex", "mathml": "6.05\\% NO3-N" }, "reading_order": 1 } ], "reading_order": 12 }, { "id": "p4.14", "order": 52, "type": "text", "bbox": { "l": 375.3477, "t": 86.8047, "r": 524.9723, "b": 66.8066 }, "text": "The shoot, root, and total dry weight of pawpaw seedlings in the bottom heat study", "reading_order": 13 }, { "id": "p4.15", "order": 53, "type": "footer", "bbox": { "l": 66.4522, "t": 59.3348, "r": 82.9581, "b": 49.0062 }, "text": "332", "attrs": { "block_label": "number" }, "reading_order": 14 }, { "id": "p4.16", "order": 54, "type": "footer", "bbox": { "l": 385.8514, "t": 59.3348, "r": 523.6861, "b": 48.5667 }, "text": "HORTSCIENCE, Vol. 37(2), APRIL 2002", "attrs": { "block_label": "footer" }, "reading_order": 15 }, { "id": "p4.17", "order": 55, "type": "footer", "bbox": { "l": 43.3011, "t": 26.5908, "r": 86.3878, "b": 18.4597 }, "text": "6807, p. 329-333", "attrs": { "block_label": "footer" }, "reading_order": 16 }, { "id": "p4.18", "order": 56, "type": "footer", "bbox": { "l": 156.0555, "t": 26.1513, "r": 167.2023, "b": 18.8992 }, "text": "332", "attrs": { "block_label": "number" }, "reading_order": 17 }, { "id": "p4.19", "order": 57, "type": "footer", "bbox": { "l": 296.2481, "t": 22.4154, "r": 306.3231, "b": 11.2077 }, "text": "⚫", "attrs": { "block_label": "number" }, "reading_order": 18 }, { "id": "p4.20", "order": 58, "type": "footer", "bbox": { "l": 362.486, "t": 27.0303, "r": 406.2158, "b": 18.8992 }, "text": "3/15/02, 2:24 PM", "attrs": { "block_label": "footer" }, "reading_order": 19 } ] }, { "document_id": 15928, "page": 5, "width": 603, "height": 783, "rotation": 0, "pipeline_version": "paddleocr-vl-1.6+paul-48", "width_pt": 603, "height_pt": 783, "engine": "paddleocr_vl", "source_run_id": 16039, "item_count": 50, "counts_by_type": { "figure": 2, "footer": 6, "formula": 1, "header": 1, "heading": 1, "text": 39 }, "build_ms": 9, "items": [ { "id": "p5.1", "order": 1, "type": "header", "bbox": { "l": 47.374, "t": 774.8689, "r": 183.2794, "b": 762.1229 }, "text": "🛋️ 📚 📚 📚", "attrs": { "block_label": "header" }, "level": 2, "reading_order": 0 }, { "id": "p5.2", "order": 2, "type": "figure", "bbox": { "l": 296.0338, "t": 772.8911, "r": 306.7519, "b": 760.8044 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image" }, "reading_order": 1 }, { "id": "p5.3", "order": 3, "type": "figure", "bbox": { "l": 419.7206, "t": 775.5282, "r": 558.6271, "b": 762.3427 }, "text": "", "attrs": { "role": "page_header", "block_label": "header_image", "embedded_text": "Growth and phosphorus, zinc, and" }, "reading_order": 2 }, { "id": "p5.4", "order": 4, "type": "text", "bbox": { "l": 77.8134, "t": 717.5119, "r": 226.3662, "b": 535.332 }, "text": "were less than in plants grown in ProMix in the media study. Fertilization regimes were slightly different. Plants in the substrate study received a weekly application of 100 mg·L [p5.4.1]N, whereas plants in the bottom heat study received twice weekly applications of 50 mg·L [p5.4.2]N fertilizer. Also, warmer ambient greenhouse temperatures, 29.1 ± 0.7 °C day and 21.2 ± 0.1 °C night, during the media experiment likely resulted in the greater growth of pawpaw seedling compared to those, 27 ± 0.8 °C day and 21 ± 0.2 °C night in the bottom heat experiment. Plants in the substrate experiment were subjected to warmer daytime temperatures, but lower temperatures at night. It is possible that there were higher losses of carbon during the night in bottom-heated plants compared to plants in the media experiment, due to increased nighttime respiration with bottom heat.", "children": [ { "id": "p5.4.1", "order": 5, "type": "text", "bbox": { "l": 77.8134, "t": 717.5119, "r": 226.3662, "b": 535.332 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 180, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 }, { "id": "p5.4.2", "order": 6, "type": "text", "bbox": { "l": 77.8134, "t": 717.5119, "r": 226.3662, "b": 535.332 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 277, "text_span": 8, "bbox_estimated": true }, "reading_order": 1 } ], "reading_order": 3 }, { "id": "p5.5", "order": 7, "type": "text", "bbox": { "l": 78.6708, "t": 534.6727, "r": 226.1518, "b": 360.6239 }, "text": "Hurewitz and Janes (1983) noted that tomato leaf carbon exchange rate and leaf area increased as soil temperature increased to[p5.5.1]. They hypothesized that increased plant growth at warmer soil temperatures may have been due to the effect of increased root sink activity on leaf photosynthetic rate. Other factors that may have contributed to the growth enhancement noted for bottom-heated seedlings included changes in water use efficiency and production or availability of root-derived cytokines. Also, with such heating there are potential decreases in both the time to produce a saleable plant and the cost of heating greenhouses (Vogelezang, 1991). Bottom-heated seedlings also produced greater lateral and total root dry weight than ambient seedlings, which could result in a higher rate of establishment of bottom-heated seedlings in the field.", "children": [ { "id": "p5.5.1", "order": 8, "type": "text", "bbox": { "l": 78.6708, "t": 534.6727, "r": 226.1518, "b": 360.6239 }, "text": "30 °C", "attrs": { "inline": true, "text_offset": 126, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 4 }, { "id": "p5.6", "order": 9, "type": "text", "bbox": { "l": 78.4565, "t": 360.1844, "r": 226.3662, "b": 267.8858 }, "text": "In conclusion, ProMix with a once weekly application of 100 mg·L[p5.6.1] N as Peters water-soluble fertilizer served as an excellent substrate for the production of robust pawpaw seedlings for transplanting into the field or into larger containers. Pawpaw seedlings responded very favorably to root-zone warming to 32 °C, by speeding seedling emergence, and increasing shoot, root, and total dry matter production in developing seedlings.", "children": [ { "id": "p5.6.1", "order": 10, "type": "text", "bbox": { "l": 78.4565, "t": 360.1844, "r": 226.3662, "b": 267.8858 }, "text": "⁻¹", "attrs": { "inline": true, "text_offset": 64, "text_span": 8, "bbox_estimated": true }, "reading_order": 0 } ], "reading_order": 5 }, { "id": "p5.7", "order": 11, "type": "heading", "bbox": { "l": 126.2592, "t": 254.2607, "r": 178.9922, "b": 245.6901 }, "text": "Literature Cited", "attrs": { "block_label": "paragraph_title" }, "level": 3, "reading_order": 6 }, { "id": "p5.8", "order": 12, "type": "text", "bbox": { "l": 80.1713, "t": 240.4159, "r": 225.9374, "b": 215.1437 }, "text": "Aiello, A.S. and W.R. Graves. 1997. 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