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

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.

¹ Part of a thesis submitted by the senior author to the Graduate School of Cornell University in partial fulfillment of the requirements for the Ph.D. degree. Financial assistance given by the American Potash Institute in support of this work.

² Associate Professor, Alabama Polytechnic Institute: Head of Department and Associate Professor, Cornell University, respectively. G. W. Gosdin also contributed to this investigation.

Received for publication January 24, 1955.