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Effect of Potash Fertilization on Yield, Stalk Breakage and Mineral Composition of Corn¹

ABSTRACT

A corn hybrid with known susceptibility to stalk breakage was grown to determine the influence of time and rate of potash fertilization at two rates of nitrogen on yield, amount of stalk breakage, and on the potassium and calcium composition of portions of the plants sampled periodically during the growing season.

Certain of the potash-treated plots yielded significantly more than the no-potash plots, but the trend was not consistent.

Stalk breakage was reduced by potash applications at the high nitrogen level, but not at the low nitrogen level. At the high nitrogen level up to 40 pounds K₂O per acre reduced stalk breakage and higher rates had no further affect.

The potash content of the plants was directly related to the rate of potash applied and for each treatment was approximately the same at the two nitrogen levels. Three methods of potash application showed no difference in their effect on the factors studied. A reciprocal relation was noted between the potassium and calcium content of the plants. A tendency toward cation equivalent constancy at the later stages of growth was observed.

¹ Contribution from the Dept. of Agronomy, Tennessee Agr. Exp. Sta. Published with the approval of the Director. Presented before Division IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 20, 1952.

² Formerly graduate assistant, and associate agronomist, respectively. This study was supported in part by a grant from the American Potash Institute, Inc.

Received for publication December 3, 1953.