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Luther C. Carson, Monica Ozores-Hampton, Kelly T. Morgan, and Steven A. Sargent

, source [mixed N (54% NH 4 + , 46% NO 3 – ) compared with urea-N], release duration, and bed placement on marketable tomato yield, LTN content, post-season soil N content, and post-harvest fruit firmness and color during the fall. Materials and Methods A

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Gerry Neilsen, Frank Kappel, and Denise Neilsen

because fruit removal and hence yield reduction is permanent regardless of factors that may alter annual fruit set. The yield reductions of ≈10%, as achieved in this study, were apparently insufficient to markedly alter fruit and leaf N–P–K concentrations

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Nicole Burkhard, Derek Lynch, David Percival, and Mehdi Sharifi

control and AS and NW treatments in 2005 (0.412% versus 0.363%) and 2006 (0.408% versus 0.350%), respectively. PN resulted in the lowest leaf tissue K in every trial year (average 0.312%). Table 6. Leaf tissue nutrient (NPK) content (%) at harvest as

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Ben Ami Bravdo

61 WORKSHOP 1 (Abstr. 1020-1035) Efficient Use of Minerals to Produce High Yield and Optimum Quality Fruit, Vegetables, and Ornamentals

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Gerry Neilsen, Peter Parchomchuk, Michael Meheriuk, and Denise Neilsen

Various schedules of 40 g N and 17.5 g P/tree per year were applied with irrigation water (fertigation) to `Summerland McIntosh' apple (Malus ×domestica Borkh.) trees on M.9 rootstock commencing the year of planting. Leaf K concentrations averaged 0.82% dry mass, indicating deficiency, by the third growing season. This coincided with extractable soil K concentrations of 50-60 μg·g-1 soil in a narrow volume of the coarse-textured soil located within 0.3 m of the emitters. The decline in leaf K concentration was reversed and fruit K concentration increased by additions of K at 15-30 g/tree applied either as granular KCl directly beneath the emitters in spring or as KCl applied as a fertigant in the irrigation water. K-fertilization increased fruit red color, size, and titratable acidity only when leaf K concentration was <1%. Fruit Ca concentration and incidence of bitter pit or coreflush were unaffected by K application. NPK-fertigation commencing upon tree establishment is recommended for high-density apple orchards planted on similar coarse-textured soils.

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Donna Ballard, Juanita Popenoe, Bradford Bearce, and Jeffrey Skousen

Strawberry (Fragaria × Anaassa cv. Tribute) plants were planted in 15 cm standard pots filled with overburden soils from three West Virginia surface mine sites. Initial pH levels were 6.5, 4.4, and 3.6. Prior to planting pH levels were adjusted with CaCO3 to 6.5-6.7 in each soil. Each soil was amended by mixing in 60.85 g/pot (62.5 dry kg/ha) of sewage sludge, Sudan-sorghum hybrid green manure crop, hardwood residues, or unamended. A dry fertilizer (.10-.045-,089, N-P-K) was also mixed into the soil at a rate of 0.5 g/pot (454 kg/ha). Plants were grown from 3-6 to 10-16, 1992, on which date harvests and measurements were performed. The sludge treatments significantly increased fresh and dry weight accumulation, number of leaves, leaf area, and number of runners per plant above that of the control plants. The hardwood residues amendment delayed first date of ripe fruit and decreased average fruit fresh weight in one of the soils. Hardwood residues also decreased leaf number in another soil. The pH levels were raised to 6.8-7.3 by the sludge in all soils and remained at or near these values during the growing period.

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Muhammad S. Hadi, William S. Conway, and Carl E. Sams

108 POSTER SESSION (Abstr. 629–636) Nutrition–Vegetables and Herbs

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Justine E. Vanden Heuvel and Carolyn J. DeMoranville

fruit that had developed beyond style fall was measured twice using digital calipers. Leaves were removed and leaf area quantified using a leaf area meter (LI 3100; LI-COR, Lincoln, NE). Leaves and fruit were put into separate bags and dried at 80 °C for

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Xiaofeng Yang, Lianzhu Chen, Ming Cao, Xuebin Zhang, and Shaopeng Li

., Lincoln, NE). The leaf length was used to estimate leaf area and LAI. Partitioning of dry matter was modeled in two steps: first, between the root and the shoot, and then among organs within the shoot. Within-shoot organs included leaf, stem, and fruit

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Gerry H. Neilsen, Denise Neilsen, Sung-hee Guak, and Tom Forge

affected, is generally modified to improve fruit quality ( Behboudian and Mills, 1997 ). In contrast, crop load has long been recognized as a major influence on apple leaf and fruit nutrient concentration ( Hansen, 1973 , 1980 ). Heavy cropping often