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This article in SSSAJ

  1. Vol. 20 No. 2, p. 228-231
     
    Received: Jan 24, 1955
    Published: Apr, 1956


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doi:10.2136/sssaj1956.03615995002000020022x

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

Abstract

Abstract

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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