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Release of Fixed Potassium from Soils by Plant Uptake and Chemical Extraction Techniques¹

ABSTRACT

Three Ohio soils of fine sandy loam, silt loam, and clay loam textures were subjected to treatments of comparable levels of potassium as KCl and K-soil (exchangeable plus fixed K prepared by adding 1000 pounds per acre of K as KCl to portions of the same soils followed by successive wetting and drying). The soils were cropped to alfalfa in pots in the greenhouse for a period of six harvests. Potassium uptake by alfalfa was 76 to 95% as great from soils treated with K-soil as from those with similar rates of KCl.

Following removal of the third crop, soil samples were taken and subjected to various chemical extractions. They included 1.0N NH₄OAc extraction of both moist and dry soils, and extractions with 1.0N boiling NHO₃. In general, none of these extractions gave a consistent indication of the residual K available to succeeding crops of alfalfa following initial K treatments and removal of the first three crops (cuttings). The results suggest some inadequacies in existing soil analyses for indicating residual K available to crops.

¹ Published with the permission of the Director of the Ohio Agr. Exp. Sta. as Journal Article No. 37-60. Presented before Div. II, Soil Science Society of America, Cincinnati, Ohio, Nov. 17, 1959. The results were used by the senior author in partial fulfillment of the requirements for the M.S. degree in 1959 from The Ohio State University.

² Research Assistant and Professor, respectively, The Ohio State University and Ohio Agr. Exp. Sta.

Received for publication May 18, 1960. Accepted for publication June 14, 1960.