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Potassium Release Characteristics of Several Soils from Ohio and New York¹

ABSTRACT

Seventeen Ohio surface soils, 25 New York surface soils, and 21 New York subsoils were investigated. Potassium release characteristics were determined by continuous cropping and by four different chemical methods. A continuous leaching method employing the use of 0.01 N HCl gave the highest correlations with continuous cropping. Cumulative amounts of potassium removed by this leaching technique were plotted to produce a family of curves with specific characteristics for each great soil group. A measure of the rate of release of K from structural positions is indicated by the slope of the line drawn between the points plotted from 5 to 10 liters of leachate.

Potassium release from both surface and subsoils followed the order of Brown Forest>Gray-Brown Podzolic>Brown Podzolic>Podzol. The average K concentration in the last 5 liters (10 liters total) of leaching solution from surface soils was as follows: Brown Forest 0.31 ppm., Gray-Brown Podzolic 0.12 ppm., Brown Podzolic 0.05 ppm., and Podzol 0.04 ppm.

¹ Joint contribution from the Department of Agronomy, Cornell University, Ithaca, New York and the Department of Agronomy, Ohio State University, Columbus, Ohio. Presented before Div. IV, Soil Science Society of America, Davis, Calif., Aug. 16, 1955.

² Formerly Assistant Professor of Soils, Cornell University; now Vice president, The Best Fertilizers Co., Oakland, Calif.

Received for publication August 13, 1955. Accepted for publication July 9, 1956.