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Potassium Release from Sand, Silt, and Clay Soil Separates¹

ABSTRACT

Four Ohio soils of divergent mineralogy were fractionated into sand, silt, and clay-sized separates after dispersion with an ultrasonic probe. Samples were extracted for 10 days with 0.01M CaCl₂ with the solution being changed each day. There was a wide range in daily and cumulative K release among the four soils for the same particle size and for different particle sizes within the same soil. When weighted according to particle size distribution of the soil, the clay was found to contribute 30–74%; silt 24–56%; and sand 3–21% of the total K released by the sum of the three separates. In all four soils, the clay separate released the most K per unit weight. The apparent rate constants for K release from the sand and clay separates were similar and renerally higher than that for the silt separates.

¹ Contribution from the Dep. of Agronomy, Ohio Agric. Res. and Dev. Ctr., Hatch 492, Journal Paper no. 89–75.

² Research Associate, Soil Science Dep., North Carolina State Univ., Raleigh, and Professors, respectively, Ohio Agric. Res. and Dev. Ctr., Wooster, and Ohio State Univ., Columbus, OH 43210.

Received for publication August 18, 1975. Accepted for publication January 20, 1976.