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Zinc Uptake and Translocation as Influenced by Phosphorus and Calcium Carbonate¹

Sand cultures with P³² and Zn⁶⁵ incorporated were used to determine the influence of CaCO₃ and P on uptake and translocation of Zn by navy bean plants (Phaseolus vulgaris). Adding CaCO₃ decreased dry weight, top-root ratio and Zn concentration in all plant parts. Calcium carbonate decreased the translocation of Zn, and increased the translocation of P, from roots to leaves. The results suggest that excess CaCO₃ influences P-Zn relationships within the plant as well as effecting solubilities of compounds of Zn and P.

Water extractable Zn and P were determined at the end of the experiment. Adding CaCO₃ decreased the amount of water extractable Zn and P. On the other hand, high P increased the amount of water extractable Zn which is evidence that the P-Zn interaction problem is not in the soil external to the plant.

Key Words: ion uptake and translocation

² Formerly Associate Professor (presently Agronomist, Deere and Company, Moline, Illinois) and Professor of Agronomy and Professor of Chemistry, respectively.

Received for publication November 6, 1967.