On the Mechanism of Phosphorus-Zinc Interaction in Corn Nutrition

Stukenholtz, D. D.; Olsen, R. J.; Gogan, Gerald; Olson, R. A.

On the Mechanism of Phosphorus-Zinc Interaction in Corn Nutrition

1966

Stukenholtz, D. D. | Olsen, R. J. | Gogan, Gerald | Olson, R. A.

Studies were carried out in the greenhouse and field to elaborate the mechanism of P-Zn interaction in the nutrition of corn (Zea mays L.). From this work depressive action of P on Zn uptake of corn appears to be largely physiological in nature, expressed at root surfaces and/or in root cells, and is not chemical inactivation of Zn by P in soil. Translocation of Zn from roots to tops is inhibited by elevated P concentration, with resulting sharp reduction in Zn concentration of nodal and internodal tissues. No clearly definable P/Zn ratio in tissue was found above which yield restriction could be predicted. Corn seems to tolerate high concentrations of P in its tissues provided some modest quantity of Zn is present. Other elements counteract somewhat the damaging effects of P. Concurrently placed N promotes Zn uptake at the same time that it benefits P utilization. Increased level of native or applied K reduces the depressive effects of P on Zn.

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