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The Kinetics of Phosphorus Desorption from Soil¹

ABSTRACT

The kinetics of P desorption for several soils was investigated at different water/soil ratios, during a short period of time, so that the results could be related to P release from agricultural soil to rainfall and runoff water. For all soils the logarithm of P release (P_d) was linearly related to the logarithm of contact time (t) at any given water/soil ratio (W) and P amendment and to logarithm of W at any given contact time and P amendment. The amount of P released was also directly proportional to the amount of desorbable P (P_o) in the soil initially. The following simplified empirical model was developed to describe the desorption of soil P,

P_d = KP_otW^ß,

where K, , and ß are constants. The simplified model gave a reasonably good description of P desorption from five southwestern soils and provided similar values of the constants K, , and ß, for each soil, over a range of experimental conditions. Consequently, we suggest that average values of the constants for each soil can be used in the model to describe P release for general applications.

¹ Contribution from the Dep. of Agronomy, Oklahoma Agric. Exp. Stn., Oklahoma State Univ., Stillwater, OK 74078, in cooperation with Southern Plains Watershed and Water Quality Lab., USDA-SEA, Durant, OK 74701. Okla. Agric. Exp. Stn. Journal Series no. 3797.

² Soil Scientists. The senior author is under a cooperative agreement with USDA-SEA, Durant and Okla. State Univ., Agreement No. 58-7B30-8-22. Address: Southern Plains Watershed and Water Quality Lab., USDA, SEA, Durant, OK 74701.

Received for publication June 9, 1980. Accepted for publication January 28, 1981.