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Effect of Lime and Potassium Additions on Soil Potassium Reactions and Plant Response¹

ABSTRACT

Lime and/or wetting-drying cycles following its application to soils of micaceous mineralogy resulted in lower exchangeable K levels, as measured by N NH₄OAc extraction, which were closely correlated with K levels before liming. K level changes were not related to initial pH levels over a range from pH 4.7 to 6.2. Liming effects on exchangeable K levels were not reflected by crop response or uptake of K. Release of nonexchangeable K was enhanced and fixation of applied K was prevented by lime applications. It is suggested Ca²⁺ ions may prop open edges of clay mineral packets, thus preventing entrapment of K⁺ ions and releasing previously "trapped" or lattice K.

¹ Published with approval of the Director of the Kentucky Agr. Exp. Sta., Lexington.

² Formerly Graduate Assistant and Associate Professor of Agronomy. Junior author now Professor of Agronomy, V.P.I., Blacksburg, Va.

Received for publication June 2, 1964. Accepted for publication July 13, 1964.