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ABSTRACT
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.
1 Published with the approval of the Director as Paper no. 1909 of the Journal Series, Nebraska Agr. Exp. Sta., Lincoln. Much of this work was done in cooperation with the Div. of Agr. Development, Tennessee Valley Authority and with the Consumers Cooperative Association of Kansas City. Presented before Div. S-4, Soil Science Society of America at Stillwater, Okla. Aug. 22, 1966.
2 Former graduate student, now Agronomist, U. S. Steel Corporation; former graduate students; and Professor, Agronomy Department, University of Neb., respectively.
Received for publication May 12, 1966. Accepted for publication June 21, 1966.
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