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Effect of Exchangeable Potassium Level and Drying upon Availability of Potassium to Plants¹

ABSTRACT

Successive croppings of Sudangrass showed that K uptake by plants was greater from soil samples that released K upon drying than from comparable continuously moist samples. For soils originally low in exchangeable K, more K was released from continuously moist samples than from similar samples which had been air-dried prior to cropping. This was considered a response to increased stress by the plants upon the K equilibrium, because of less readily available K in the continuously moist samples.

Potassium uptake data, reductions in exchangeable K levels, and K-release patterns strongly suggested that added K fixed by drying was available for plant use. Crop yields were the same for both moist and air-dried soil samples at high levels of exchangeable K; but, yield data did reflect K released by drying samples initially low in exchangeable K.

¹ Contribution of the Agronomy Department, University of Kentucky, Lexington. Published with approval of the Director of the Kentucky Agr. Exp. Sta. Appreciation is expressed to the American Potash Institute for partial support of this research.

² Formerly Graduate Assistant and Associate Professor of Agronomy, respectively.

Received for publication October 26, 1962. Accepted for publication January 25, 1963.