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Nutrition of Corn on a Calcareous Soil: I, Interrelationships of N, P, K, Mg, and S on the Growth and Composition¹

ABSTRACT

A factorial experiment was carried out with irrigated corn grown on a calcareous soil to determine the effect of N, P, K, Mg, and S, both singly and in combination, on the production of grain and stover, and on the composition of the leaves. Multiple regression equations in quadratic logarithmic form were developed in order to elaborate the effects.

The soil used was inherently fertile and the first order effect of the nutrients was very small for grain and stover yield. The interaction of Mg and S was significantly positive in effect on grain yield. If application of either Mg or S was high, there was a large positive response to the other, while if application of either Mg or S was low, there was a large negative response to the other. However, for yield of stover the Mg-S interaction was significant and negative or opposite in effect. The contrasting effect between grain and stover yields was further indicated by the interactions between the three anion nutrients, N, P, and S, which were all negative for grain production and all positive for stover production. The interactions of K and Mg on stover production were opposite in effect. The K-S, K-P, and K-N interactions were positive while the Mg-S, Mg-P, and Mg-N interactions were negative; the elemental composition was affected to a considerable extent by various interactions as well as by the first order effects of the elements involved.

¹ Authorized for publication on Dec. 13, 1962 as Journal No. 94 by the Faculty of Agricultural Sciences of the American University of Beirut, Lebanon. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree.

² Former Graduate Fellow and Associate Professor of Soils, respectively.

Received for publication December 13, 1962. Accepted for publication August 26, 1963.