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Allen V. Barker

Mineral Nutrition and Plant Disease. Lawrence E. Datnoff, Wade H. Elmer, and Don M. Huber (editors). 2007. APS Press, St. Paul, MN. 278 pages. $89.00 Hardcover. ISBN 978-0-89054-346-7. This book covers the relationship of mineral nutrients

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Ji Jhong Chen, Haifeng Xing, Asmita Paudel, Youping Sun, Genhua Niu, and Matthew Chappell

at ECs of 4.4 and 7.4 dS·m –1 . The objective of our study was to investigate the effects of saline solution irrigation on the physiological responses and mineral nutrition status of 12 viburnum taxa. Materials and Methods Plant materials and

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Ryan C. Costello, Dan M. Sullivan, David R. Bryla, Bernadine C. Strik, and James S. Owen

., 2008 ). Leaf Mn is often high in blueberry due to the acidic growing conditions ( Retamales and Hancock, 2012 ). Relationships between key chemical compost traits and plant growth and mineral nutrition of northern highbush blueberry One of the primary

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George Ouma and Frank Matta

Experiments were performed in 1995 and 1996 at the Mississippi State Univ. Agricultural Experiment Station, Pototoc Ridge, to investigate the effect of Accel and carbaryl sprayed 2 weeks postbloom on fruit set, yield, and plant nutrition of three apple cultivars (Empire, Jon-A-Red, and Braeburn). The treatments consisted of Accel 25 ppm, Accel 50 ppm, Accel 75 ppm, Carbaryl 0.05%, Carbaryl 0.1%, Carbaryl 0.2%, and an unsprayed control. Thinning trials using the two bioregulators conducted over 2 years indicated that Accel and Carbaryl consistently thinned the apple cultivars and increased the yields. Leaf mineral concentrations were affect by the treatments. In 1995, the treatments affected leaf concentrations of N, Ca, and Mg, while in 1996 the treatments affected the leaf contents of N, P, K, Ca, Mg, Fe, Mn, and Zn, but no copper. The treatments also affected the fruit flesh mineral concentration by increasing the contents of K, P, and Mg in 1996. It can therefore be concluded that, depending on apple cultivar, N content was reduced by the treatments while Ca and Mg were generally increased. Similarly, the fruit flesh contents of Fe, K, P, and Mg were also increased. The two bioregulators therefore thin apples, increase yields, and affect the fruit quality.

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Kaitlyn M. McBride, Richard J. Henny, Terri A. Mellich, and Jianjun Chen

Marschner’s mineral nutrition of higher plants. 3rd Ed. Academic Press, Inc., New York, NY McBride, K. Henny, R.J. Chen, J. Mellich, T.A. 2014 Effect of light intensity and nutritional level on growth and flowering of Adenium obesum ‘Red’ and Ice Pink

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J. Lopez, L.E. Parent, N. Tremblay, and A. Gosselin

52 ORAL SESSION 16 (Abstr. 129–136) Nutrition/Vegetables

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Baerbel Hoelldampf and Allen V Barker

Coniferous forest trees showing chlorosis and dieback appear to be deficient in Ca and Mg. These deficiencies may be induced by nitrogenous nutrients borne in the atmosphere. This study assessed the roles of nitrogen nutrition and soil on nutrient accumulation by red spruce (Picea rubens, Sarg.) and radishes (Raphanus sativus, L.). Plants were grown in the greenhouse in acid O or A horizons (Typic Haplorthod) collected from a red spruce forest. Plants were grown with a complete nutrient solution with 15 mM N of which NH4 was 0, 3.75, 7.5, 11.25, or 15 mM with the remainder being NO3 -. After 120 days, the spruce needles became chlorotic with 11.25 or 15 mM NH4. Radishes exhibited NH4-toxicity after 28 days. Radishes were larger in the O horizon than in the A horizon. As NH4 was increased, radishes had lesser dry weights and accumulated less foliar Ca. Foliar Ca also was lower in spruce with the higher NH4. Magnesium concentrations in leaves of red spruce and radishes were not affected significantly by increasing NH4 supply. Radishes are suitable indicator plants to study the effect of nitrogen form on mineral nutrition of spruce because each species responded similarly to the treatments.

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Antonio L. García, Jesús Gallego, Vicenta Fuentes, Nuria Nicolás, and Ramón Madrid

The effects of different levels of phosphorus fertilization and water provision on the mineral nutrition of two clonal rootstocks of Prunus were studied. Two-year-old Prunus seedlings, Hybrid GF677 (Prunus persica × Prunus amygdalus) (PH) and Pollizo Puebla de Soto 101 (Prunus insititia) (PI) were planted in an uncultivated calcareous soil (a Xeric torriorthent derived from marl) under greenhouse conditions. They were drip irrigated with subterranean water of slightly alkaline pH (7.63), EC 0.88 dS·m–1, with a low chloride and high sulphate content. The experiment lasted two annual cycles. In October of the second year the leaf nutrient concentration and dry weight of the total leaf weight were determined in four trees of each combination of rootstock × irrigation level × fertilization treatment. The nutritive state of these trees was analyzed by vector analysis. The results point to a highly significant influence of the rootstock nature on the leaf concentrations of most nutrients. Very low Zn and Cu concentrations were recorded on both rootstocks, for both irrigation levels and several fertilizing treatments. Vector analysis confirmed the Cu deficiency resulting from several of the fertilizing treatments and both irrigation levels in PH rootstocks.

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John Clemens and R. Hugh Morton

1 Institute of Molecular BioSciences. 2 Associate Professor, Food, Nutrition and Human Health Research Institute. The scientific and technical assistance of I.R. Brooking and A.J. Rodgers, respectively, are gratefully acknowledged. The cost of

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Xinhua Yin, Clark Seavert, and Jinhe Bai

Poster Session 41—Nutrition 30 July 2006, 1:15–2:00 p.m.