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This article in SSSAJ

  1. Vol. 20 No. 2, p. 228-231
    Received: Jan 24, 1955

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The Relationship of Water Soluble and Exchangeable Potassium to Yield and Potassium Uptake by Ladino Clover1

  1. J. T. Hood,
  2. N. C. Brady and
  3. D. J. Lathwell2



An attempt was made to evaluate in a relative way the K in the soil solution as a measure of the immediately available potassium in the soil. When the K content of Ladino clover was below the critical level, the water soluble potassium, a measure of the K in the soil solution, was better correlated with yield than was exchangeable K. The water soluble potassium also gave a better correlation with the potassium absorbed by plants in a short period of time. A percolation procedure which consisted of leaching a soil with a large volume of a low electrolyte extractant was a better measure of the K supplying power of a soil than the initial exchangeable level of potassium.

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