INFLUENCE OF PHOSPHORUS ON ZINC, IRON, MANGANESE, AND COPPER UPTAKE BY PLANTS

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Abstract
Five cultivars of soybeans (Glycine max. L.) and a bush bean (Phaseolus uulgrais L. cv 'Improved Tendergreen') were grown in nutrient solutions with different P levels, solution pH, and, in the case of bush bean, at different Fe levels. The objective of the experiments was to obtain more definitive answers to problems of P-induced Zn and Fe deficiencies. Differntial solution pH, obtained by adding solid phase CaCO3 to the nutrient solution (about pH 7) vs. a regular solution (about pH 4–5), indicates that pH is very important in the effects obtained. At high pH, increasing solution P decreased the leaf, stem, and root concentrations of Zn, Mn, and Cu in soybeans. Iron was decreased in roots, but not in leaves and stems. In contrast, at low pH, increasing the P resulted in more Zn, Mn, and Cu but less Fe in leaves, stems, and roots. Results with bush beans were only slightly different from those with soybeans, and the Zn-P effects were modified slightly by Fe levels. High P decreased Fe transport to leaves in bush beans at low and high pH, but only at the high Fe level. © Williams & Wilkins 1978. All Rights Reserved.

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