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This article in AJ

  1. Vol. 49 No. 7, p. 377-381
    Received: Jan 25, 1957

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

  1. T. W. Scott and
  2. F. W. Smith2



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.

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