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doc15932 PomperHT02-1.pdf
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"text": "Determination of the Optimal Rate of Slow-release Fertilizer for Enhanced Growth of Pawpaw Seedlings in Containers",
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"text": "Kirk W. Pomper,[p1.2.1]\nDesmond R. Layne,[p1.2.2] and\nEddie B. Reed[p1.2.3]",
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"text": "ADDITIONAL INDEX WORDS. Asimina triloba, root:shoot ratio, kentucky banana"
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"text": "SUMMARY. Growth of pawpaw\n(Asimina triloba) seedlings in containers was examined in a factorial greenhouse experiment with four treatment levels of the slow-release fertilizer, Osmocote 14–14–14 (14N–6.1P–11.6K), incorporated in Pro-Mix BX potting substrate at 0, 0.13, 0.26 or 0.81 kg·m[p1.4.1] (0, 0.22, 0.44, or 1.37 lb/yard[p1.4.2]) and three treatment levels of liquid-feed fertilizer of Peters 20–20–20 (20N–8.7P–16.6K) water-soluble fertilizer at 0, 250, or 500 mg·L[p1.4.3] (ppm). When plants were harvested 18 weeks after sowing, seedlings subjected to the highest rate of Osmocote 14–14–14 at 0.81 kg·m[p1.4.4] and liquid-feed at 500 mg·L[p1.4.5] had the greatest total biomass, about 3-fold greater than nonfertilized plants. In a separate greenhouse experiment, growth of seedlings was examined",
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"text": "with Osmocote 14–14–14 as the sole fertilizer source at six treatment levels of: 0, 0.81, 2.22, 4.43, 8.86, or 17.7 kg·m[p1.5.1] (0, 1.37, 3.74, 7.47, 14.9, or 29.9 lb/yard[p1.5.2]). Early seedling growth was hastened in the 2.22 kg·m[p1.5.3] treatment rate, but delayed in 17.7 kg·m[p1.5.4] treatment rate, when compared to nonfertilized control plants. When seedlings were harvested 17 weeks after sowing, plants had the greatest shoot, root, and total dry weight with Osmocote 14–14–14 at a rate of 2.22 kg·m[p1.5.5]. Root:shoot ratio decreased from about 1.5 without Osmocote 14–14–14, to about 0.65 at rates of 2.22 kg·m[p1.5.6] or greater. Based on the results of this study, the slow-release fertilizer, Osmocote 14–14–14, can be used effectively as a sole fertilizer source when incorporated into potting substrate at a rate of 2.22 kg·m[p1.5.7] or at a reduced rate of 0.81 kg·m[p1.5.8] when supplemented with weekly applications of liquid-feed fertilizer at a rate of 500 mg·L[p1.5.9] of Peters 20–20–20, to enhance production of container-grown pawpaw seedlings.",
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"text": "The North American paw-\npaw has potential as a high-\nvalue tree-fruit crop or as a\nlandscape component (Layne, 1996;\nPomper et al., 1999). Historically,\npawpaws have been difficult to propa-\ngate. Pawpaws develop a strong tap-\nroot with a fragile root system, which\ncan be easily damaged upon digging;\ntherefore, most commercial nurseries\nin the United States propagate their\nown pawpaw trees in containers (un-\npublished). Although this results in a\nsignificantly greater cost to the pur-\nchaser, trees usually have a strong, healthy\nroot system for field establishment. Un-\nfortunately, high prices for seedling and\ngrafted trees are limiting the develop-\nment of a commercial pawpaw industry.\nRecent studies at Kentucky State Uni-\nversity have developed recommendations\n(e.g., potting substrate type, the\nuse of tall containers to accommodate\nthe seedling’s strong tap root, etc.) to-\nward the successful container produc-\ntion of pawpaw (Finneseth et al., 1998a,\n1998b; Jones et al., 1998; Layne, 1996;\nPomper et al., 2002a, 2002b). How-\never, further improvements in cultural\nmethods for container production of\nrobust pawpaw seedlings for grafting,\ntransplanting to orchards, or home land-\nscapes would be desirable.\nThere is little information available\non the fertilization requirements of paw-"
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"text": "paw. Slow-release fertilizers are an efficient means to meet the nutritional needs of container-grown nursery crops. Osmocote is a popular encapsulated, slow-release fertilizer that provides a relatively constant supply of nutrients for plant absorption over a fixed time frame. Because fertilizers such as Osmocote release nutrients slowly, they eliminate the need for labor-intensive liquid fertilization that may lead to excessive nutrient leaching and contamination of ground water (Nelson, 1998). Osmocote, alone or in combination with water-soluble fertilizer, has been used to successfully produce many tree species in containers. For example, false weymouth pine (Pinus pseudostrobus) and douglas pine (Pinus douglasiana) trees grew well when fertilized using Osmocote 14–14–14 at a rate of 4 kg·m⁻³ (6.74 lb/yard³) (Mexal et al., 1995). River birch (Betula nigra), bald cypress (Taxodium distichum), sycamore (Platanus occidentalis), and weeping willow (Salix babylonica) have been grown successfully outdoors in containers with Osmocote 16–7–12 (16N–3.1P–10K) at a rate of 13 kg·m⁻³ (21.9 lb/yard³) (Ruter, 1994). Green ash (Fraxinus pennsylvanica) and red oak (Quercus rubra) have been grown successfully in containers with Osmocote 18–6–12 (18N–2.6P–10K) at a rate of 3.6 kg·m⁻³ (6 lb/yard³), supplemented with weekly applications of 200 mg·L⁻¹ N from 20–20–20 (20N–8.7P–16.6K) water soluble fertilizer (Arnold and Struve, 1989). Pomper et al. (2002b) found that pawpaw seedlings grew well in Pro-Mix BX potting substrate (Premier Horticulture, Inc., Red Hill, Pa.) with weekly liquid-feed applications of 500 mg·L⁻¹ Peters 20–20–20 water-soluble fertilizer plus soluble trace elements; however, further examination of specific nutritional requirements for container production of pawpaw seedlings could lead to enhanced growth of seedlings."
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"text": "The objective of this study was to examine early growth and development of greenhouse-grown pawpaw seedlings with either slow-release fertilizer (Osmocote) as the sole fertilizer source or with Osmocote supplemented by water-soluble fertilizer, in an effort to determine the optimal fertilization for enhanced growth of pawpaw seedlings in containers."
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"text": "Materials and methods\nPLANT MATERIAL. For all experi-"
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"text": "Kentucky State University, Land Grant Program, 129 Atwood Research Facility, Frankfort, KY 40601-2355.",
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"text": "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 S. Jones is also gratefully acknowledged by the authors.",
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"text": "[p1.12.1]Principal investigator of horticulture and curator, USDA National Clonal Germplasm Repository for Asimina sp., Kentucky State University, and president of The PawPaw Foundation. To whom reprint requests should be addressed.",
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"text": "[p1.13.1]Assistant professor of pomology and extension fruit specialist, Dept. of Horticulture, Box 340375, Clemson Univ., Clemson, SC 29634-0375.",
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"text": "ments, pawpaw seed was harvested from open-pollinated half-sib trees at the Keedysville, Md., orchard at the Western Maryland Research and Education Center. Seed was stratified at 5 °C (41 °F) for 3 months and was sown to a 3-cm (1.2-inch) depth in moist Pro-Mix BX potting substrate in 5 × 6.4 × 25.4-cm (2 × 2.5 × 10-inch) Roottrainers (Hummert Intl., Earth City, Mo.) with a volume of 740 cm³ (45 inch³). The initial electrical conductivity (EC) of Pro-Mix BX substrate was determined to be 1.02 dS·m⁻¹ and the nitrate (NO₃)⁻ concentration at 18 mg·L⁻¹ by the University of Kentucky Division of Regulatory Services (Lexington). Seedlings were grown in a white-washed glass greenhouse under a 16-h photoperiod supplemented by high-pressure sodium lights. At noon on a representative sunny day on 27 Apr. 2000, photosynthetic photon flux (PPF) was measured at 1200 μmol·m⁻²·s⁻¹ at canopy level using a LI-185B photometer with a Q7072 quantum sensor (LI-COR, Inc., Lincoln, Nebr.) with the supplemental lights on."
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"text": "Table 2. Leaf number and plant height of pawpaw (Asimina triloba) seedlings grown in a greenhouse with three levels of soluble fertilizer [Peters 20–20–20 (Peters)] and four levels of slow-release fertilizer [Osmocote 14–14–14 (Osmocote)].",
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Page 3
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Page 3 JSON
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"text": "Co.) at 0 (control), 0.13, 0.26, or 0.81 kg·m⁻³; see Table 1 for treatment designations. Each subplot treatment consisted of a Rootrainer (27 cells) that contained Pro-Mix BX to which appropriate amounts of slow-release fertilizer had been incorporated. On 7 Feb. 2000, single seeds were sown into each cell of the Rootrainer so that in each of the three replicate blocks, 27 seeds were sown per treatment combination. A total of 972 seeds were sown (3 blocks × 3 main plot treatments × 4 subplot treatments × 27 seeds = 972 seeds). Seedlings were watered to saturation at least once each week, or as needed during the experiment. Ten weeks after sowing, on 17 Apr. 2000, when plants attained the two- to three-leaf stage, seed germination rate was recorded. At this time 10 uniform seedlings per experimental combination, or Rootrainer, were marked in each block, and leaf number and height were determined. Weekly fertilization treatments were also initiated at this time by manually saturating media with the appropriate liquid fertilizer; water used for preparation of the treatments had a total N content [NO₃ and ammonia (NH₄)] of about 0.7 mg·L⁻¹ (Scott Laboratories, Allentown, Pa.). The number of leaves per plant and seedling height were recorded on 13 June 2000, 18 weeks after sowing, when plants were destructively harvested. Stems, leaves, and roots were oven-dried at 70 °C (158 °F) for 48 h and weighed. 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 (±SE) were 25.1 ± 0.1, 31.3 ± 0.3, and 34.0 ± 0.7 °C, (77.2 ± 0.1, 88.3 ± 0.3, and 93.2 ± 0.7 °F), at 0300, 1200, and 1600 HR, respectively."
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"text": "EXPERIMENT 2. SLOW-RELEASE FERTILIZER APPLICATION ONLY. To"
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"text": "examine growth of container-grown\npawpaw seedlings with slow-release\nfertilizer as the sole fertilizer source, a\ngreenhouse experiment was conducted\nwith six treatment levels of Osmocote\nat 0 (control), 0.81, 2.22, 4.43, 8.86,\nor 17.72 kg·m⁻³ (designated A to E;\nsee Table 1). A replicated block exper-\nimental design, with three replicate\nblocks, was used with each block con-\ntaining each of the six treatments ar-\nanged randomly in each block. Each\ntreatment in each block consisted of a\nRootrainer (27 cells) containing Pro-\nMix BX to which appropriate amounts\nof slow-release fertilizer had been in-\ncorporated. On 30 June 2000, single\nseeds were sown into each cell of the\nRootrainer so that in each of the three\nreplicate blocks, 27 seeds were sown\nper treatment combination. A total of\n324 seeds were sown (3 blocks × 4\ntreatments × 27 seeds = 324 seeds\nsown). Seedlings were watered at least\nonce each week to runoff, or as needed\nduring the experiment. On 6 Sept.\n2000, 10 weeks after sowing, plants in\nall treatments had attained at least the\ntwo- to three-leaf stage, and seed ger-\nmination rate was recorded. At this\ntime, 10 uniform seedlings were\nmarked, and leaf number and height\nwere recorded. Thereafter, leaf num-\nber and height measurements were\nrecorded weekly. The number of leaves\nper plant and seedling height were\nrecorded on 26 Oct. 2000, 17 weeks\nafter the initial height measurements,\nwhen plants were destructively har-\nvested. Stems, leaves and roots were\noven-dried at 70 °C (158 °F) for 48 h\nand weighed. The greenhouse air tem-\nperature was monitored as described\npreviously. Average greenhouse air\ntemperatures (±SE) were 23.5 ± 0.1,\n29.1 ± 0.3, and 32.6 ± 0.7°C, (74.3 ±\n0.1, 84.4 ± 0.3, and 90.7 ± 0.7°F), at\n300, 1200, and 1600 HR, respectively,"
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"text": "Fig. 1. Response of pawpaw (Asimina triloba) seedlings to Osmocote 14–14–14 (14N–6.1P–11.6K) slow-release fertilizer incorporated in the potting substrate at different rates for seedling leaf number (A) and seedling height (B) 10 to 17 weeks after sowing. Letters correspond to treatment means that were significantly different by least significant difference (P < 0.05) at each date; 1 kg·m[p4.5.1] = 2.2 lb/yard[p4.5.2], 1 cm = 0.39 inches.",
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"text": "control and medium Osmocote treatment rate, with the greatest root dry weight occurring at 500 mg·L[p4.6.1] Peters (see columns in Table 3). Root dry weight within each level of Peters showed a quadratic response to increasing rate of Osmocote, with the greatest root dry weight at the me-",
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"text": "dium and high treatment rates of Osmocote (see rows in Table 3). Shoot dry weight showed a linear response to increasing rate of Peters at all rates of Osmocote, with the greatest shoot dry weight at the highest rate of Peters. Shoot dry weight within each level of Peters showed a quadratic response to increasing treatment rates of Osmocote, with the greatest shoot dry weight at both the highest treatment rates of Osmocote and Peters. Total plant dry weight showed a linear response to increasing rate of Peters in the control, medium, and high treatment rates of Osmocote. Total plant dry weight showed a quadratic response to increasing rates of Peters at the low treatment rate of Osmocote. Total plant dry weight within each"
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"text": "level of Peters showed a linear response to increasing rates of Osmocote, with the greatest total plant dry weight at the highest treatment rates of Osmocote and Peters. Root to shoot ratio showed a quadratic response in the Osmocote control, and a linear response at the low, medium, and high treatment rates of Osmocote, to increasing rates of Peters. Root to shoot ratio within each level of Peters showed a linear response to increasing treatment rate of Osmocote without Peters application, with the lowest root to shoot ratio at the high treatment rate of Osmocote. Root to shoot ratio in either the 250 or 500 mg·L[p4.8.1] Peters treatment levels showed a quadratic response to increasing rate of Osmocote, with the lowest root to shoot ratio (0.67) at the highest treatment rates of both Peters and Osmocote.",
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"text": "EXPERIMENT 2. SLOW-RELEASE FERTILIZER APPLICATION ONLY. No significant treatment differences were observed for seed germination percentage (average germination percentage was 70%; data not shown). Note that treatment A for Osmocote in this experiment is the same rate as the high rate of 0.81 kg·m[p4.9.1] used in the slow-release and weekly liquid-feed fertilizer application experiment described previously. Seedling emergence and growth, based on leaf number at 10 weeks after sowing, were hastened in treatment B and delayed in treatment E (Fig. 1A). Thirteen weeks after sowing, seedling leaf number in all other treatments was similar to that in treatment B, except for seedlings in treatment E which had two to three leaves where seedling in all other treatments had four to five leaves. When seedlings were harvested 17 weeks after sowing, plants in treatment D had the highest leaf number and control plants had the lowest number. Seedlings in treatment E had accelerated growth over the last 3 weeks of culture, finishing with a similar number of leaves to those in treatments C and D.",
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"text": "Seedling height, 10 weeks after sowing, was about 4 cm (1.6 inches) in treatment E; seedlings had already reached a height of about 8 cm (3.1 inches) in treatment B and about 6.5 cm (2.6 inches) in all other treatments by this time (Fig. 1B). Thirteen weeks after beginning measurements, seedling heights obtained with treatment E were lowest, whereas heights for"
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Page 5
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"text": "Fig. 2. The influence of Osmocote 14–14–14 (14N–6.1P–11.6K) slow-release fertilizer rates on biomass production by container-grown pawpaw (Asimina triloba) seedlings in a greenhouse. (A) root dry weight (y = 0.805 + 0.018x–0.002x², R² = 0.74, P = 0.001), (B) shoot root dry weight (y = 0.768 + 0.148x–0.008x², R² = 0.58, P = 0.001), (C) total plant dry weight (y = 1.577 + 0.167x–0.010x², R² = 0.58, P = 0.001), (D) root:shoot ratio (y = 1.210 + 0.142x–0.007x², R² = 0.65, P = 0.001). Each symbol is the mean of three blocks, ± SE; 1 kg·m⁻³ = 2.2 lb/yard³, 1 g = 0.035 oz.",
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"text": "treatment B were greatest. At harvest, seedling heights in treatment B were still the greatest; however, seedlings at treatment E had grown more rapidly during the final 3 weeks and attained a height similar to those in the control and treatment A."
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"text": "At the termination of the experiment, shoot, root, and total plant dry weight showed a quadratic response curve to increasing rates of Osmocote (Fig. 2). Plants had the greatest shoot, root, and total plant dry weight in treatment B (Fig. 2A, 2B, and 2C). Root to shoot ratio showed a quadratic response curve, in which the root to shoot ratio decreased from about 1.5 with no Osmocote applied,"
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"text": "to about 0.65 with Osmocote at rates at or exceeding 2.22 kg·m[p5.9.1] (Fig. 2D).",
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"text": "Based on the results of this study, the 4-month formulation of Osmocote 14–14–14 can be used effectively as the sole fertilizer source at treatment rate B (2.22 kg·m⁻³) or at the lower treatment rate A (0.81 kg·m⁻³), which was the high rate in the first experiment, when supplemented with weekly applications of 500 mg·L⁻¹ of Peters 20–20–20 liquid-feed fertilizer for enhanced production of pawpaw seedlings in containers. Pawpaw seedlings responded well even to low rates of fertilization with Osmocote or Peters with enhanced growth. When plants in the slow-release and liquid-feed fertilizer application experiment were fertilized with the high rate of Osmocote [0.81 kg·m⁻³ (1.37 lb/yard³)], and 500 mg·L⁻¹ liquid-feed fertilizer, total plant dry weight [3.53 g (0.12 oz)] was greater than that [2.46 g (0.09 oz)] of plants in sole slow-release fertilizer application experiment receiving treatment B of Osmocote as the sole fertilizer application. Control seedlings were similar in total dry weight in both Expt. 1 and Expt. 2. In the slow-release and liquid-feed fertilizer ap"
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"text": "plication experiment, plants fertilized with the high rate of Osmocote (0.81 kg·m⁻³) and seven weekly applications of 500 mg·L⁻¹ Peters liquid-feed fertilizer received a total of 116 mg (0.004 oz) of N, whereas 230 mg (0.008 oz) of N was supplied to plants in the sole slow-release fertilizer application experiment that received treatment rate B of Osmocote as their only fertilizer amendment. Thus, the greater total plant dry weight of seedlings in Expt. 1, fertilized with the high rate of Osmocote [0.81 kg·m⁻³ and 500 mg·L⁻¹ liquid-feed fertilizer, than in seedlings in Expt. 2, fertilized solely with treatment rate B of Osmocote, was achieved even though the plants in Expt. 1 received only about 50% as much total N as plants in treatment B. The greenhouse environment was warmer during Expt. 1 than during Expt. 2, which may have promoted growth of the seedlings during the former experiment. The warmer greenhouse temperatures may have promoted greater nutrient release rates by the Osmocote; however, since higher nutrient treatment rates in the slow-release fertilizer application only experiment did not enhance growth further, the warmer temperatures in the earlier experiment likely resulted in greater plant biomass accumulation by stimulating plant growth and nutrient uptake. Pomper et al. (2002b) found that bottom heat [32 °C (90 °F)] increased total pawpaw seedling dry weight by 87% compared to plants grown at ambient root-zone conditions [24°C (75 °F)]. Other differences in the cultural conditions during the experiments could also have affected plant growth; spring PPF may have been lower than summer levels. Seedlings grown at either the high rate of Osmocote (0.81 kg·m⁻³), supplemented with 500 mg·L⁻¹ Peters liquid-feed fertilizer, or Osmocote in treatment B had similar root to shoot ratios of about 0.65, indicating that both these fertilizer regimes resulted in excellent seedling shoot production."
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"text": "Finneseth et al. (1998a) reported that early pawpaw seedling development can be divided into four distinct stages, including radicle protrusion, hypocotyl emergence, epicotyl elongation, and seedcoat abscission. At the time of epicotyl elongation, which can be more than 50 d after sowing, the radicle and developing root system can comprise up to 81% of the seedling biomass. When plants were grown with"
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"text": "Osmocote incorporated in the potting substrate as the sole fertilizer source, seedling emergence and growth were hastened in treatment B, compared to that of control plants. This was likely the result of the acceleration of the four stages of seedling development due to Osmocote being incorporated in the substrate. The highest treatment rate E inhibited plant growth, indicating that the nutrient levels at this rate were actually above what the plants prefer or that soluble salt levels in the substrate at this fertilization rate may have been too high. Electrical conductivity of the substrate was not measured during the experiment. At harvest, seedlings in treatment B were still tallest; however, seedlings in treatment E demonstrated accelerated growth 12 weeks after sowing and attained a height similar to those in the control and treatment A."
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"text": "Hershey and Paul (1983) and Raither and Frink (1989) both reported that leaching of nutrients from slow-release fertilizer was highest during the early part of the growing season. It would seem likely that plant growth in treatment E accelerated as Osmocote nutrients and/or soluble salts were leached from the substrate; thereby, reducing the nutrient levels in the substrate and promoting growth of the seedlings. Tall containers are used in the production of pawpaw seedlings in order to accommodate the strong taproot produced (Layne, 1996). Further studies to determine the effect of the placement of slow-release fertilizer application in containers (incorporated uniformly throughout the container versus top-dressing) on nutrient leaching and pawpaw seedling growth would be desirable. More frequent application of smaller quantities of slow-release fertilizer and placement in the container could also be helpful to reduce nutrient leaching; however, this would"
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"text": "result in additional labor costs. The Peters 20–20–20 plus soluble trace elements used in this study contained 3.9% ammoniacal N, 6.1% [p6.4.1]-N, and 10.0% urea N, whereas Osmocote 14–14–14 contained 8.2% ammoniacal N, 5.8% [p6.4.2]-N, and no urea. Ammonia and urea need to be converted to[p6.4.3] to be taken up by the plant. Further studies would be required to determine if pawpaw seedlings prefer a particular form of N and whether the N form in the fertilizer formulations used in these experiments affected pawpaw growth. The pH and soluble salt concentration of potting substrate that has been amended with high rates of Osmocote and the influence of these parameters on pawpaw growth in containers should also be examined further.",
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"text": "Jones, S.C., R. N. Peterson, T. Turner, K.W. Pomper, and D. R. Layne. 1998. Pawpaw planting guide: Cultivars and nursery sources. KSU Pawpaw Ext. Bul. 001.",
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