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ABSTRACT
Experimental data on the phosphate release and sorption in soils, when inadequately described by a first-order kinetic reaction, are often interpreted as a combination of two or three simultaneous first-order reactions. A simple modified Elovich equation in the form: q = (1/ß) ln (
ß) + (1/ß) ln t was derived to fit the reported experimental data in literature that failed to conform to a single first-order kinetic equation. In this equation, q is the amount of phosphate released or sorbed, and and ß are constants. The equation successfully described the data as a single straight line that covers the entire course of reaction time. It also appears that constants of and ß may be used for comparison of reaction rates of phosphate release or sorption in different soils.
1 Contribution from the Fertilizer Technology Division, Int. Fertilizer Development Center, Muscle Shoals, AL 35660.
2 Research Soil Chemist and Chemist, respectively.
Received for publication July 26, 1979. Accepted for publication November 7, 1979.
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