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Effect of Drying Upon Availability of Potassium in Parsons Silt Loam Surface Soil and Subsoil¹

Sypnosis: Drying of both surface and subsoil approximately doubled exchangeable potassium content. Extensive cropping of soils not fertilized with KC1 apparently reduced exchangeable potassium to near minimum levels. However, plant uptake of potassium always was greater from previously dried soil than from that kept continuously moist. A single unit of exchangeable potassium in continuously moistened soil was from 20 to 26% more available than the same unit in dried soil. Similarly a single unit in surface soil appeared to be from 10 to 16% more available than a single unit in subsoil.

² Former Graduate Assistant and Professor of Soils, respectively. Presented before Division IV of Soil Science Society of America on November 14, 1956.

Received for publication January 25, 1957.