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Published in Soil Sci Soc Am J 51:912-917 (1987)
© 1987 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Kinetics of Soil Potassium Desorption1

A. N. Sharpley2

ABSTRACT

The kinetics of soil K desorption from five soils was investigated at different water/soil ratios (10:1–400:1), over a short period of time (30 min), so that the results could be related to K desorption from agricultural soils to rainfall and drainage water. Potassium desorption (Kd) was logarithmically related to contact time (t) at any given water/soil ratio (W) and K addition and to W at any given contact time and K addition. Potassium desorption was also directly related to the initial exchangeable K content of soil. The following kinetic equation previously developed for soil P desorption, described soil K desorption, Kd = k K0 t{alpha} WB where k, {alpha}, and ß are constants. The kinetic constants, k (r2 = 0.91), {alpha} (r2 = 0.91), and ß (r2 = 0.92) were related to cation exchange capacity (CEC). Unlike previous K desorption equations—(i) the uniformity of k, {alpha}, and ß for a given soil, in accounting for the effects of reaction time, water/soil ratio, and soil K status on K desorption, and (ii) the fact that the constants can be estimated from CEC—may allow application of the equation to the prediction of soil K desorption in surface and groundwater quality and plant nutrient uptake modeling.

NOTES

1 Contribution from the U.S. Dep. of Agric., Agric. Res. Service, Water Quality and Watershed Research Labor., Durant, OK 74702.

2 Soil Scientist, Water Quality and Watershed Research Laboratory, P.O. Box 1430, Durant, OK 74702-1430.

Received for publication July 28, 1986.




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