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This article in SSSAJ

  1. Vol. 25 No. 2, p. 123-125
    Received: Mar 24, 1960
    Accepted: Dec 19, 1960

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Effect of Drying Some Ohio Soils Upon the Soil Test for Potassium1

  1. J. B. Jones Jr.,
  2. H. J. Mederski,
  3. D. J. Hoff and
  4. J. H. Wilson2



Most Ohio soils release K (from a nonexchangeable form to exchangeable) upon air drying from the field-moist state. The amount released varies from 25 to 100 pounds per acre depending upon soil type. The effect of this release upon the interpretation of soil test recommendations was found to be not significant. Correlations between soil test level and corn yield response to K fertilization were the same or better using air-dried samples as compared with the field-moist samples. Further drying at 110°C. for 24 hours slightly increased or decreased the amount of exchangeable K depending upon the soil type. These values were, in some instances, poorly related to the yield response. Of the three procedures, air drying at room temperature prior to extraction gave the best estimate of the available K level.

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