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This article in SSSAJ

  1. Vol. 39 No. 3, p. 594-596
    Received: June 12, 1974
    Accepted: Mar 17, 1975

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Leaching of Adsorbed Potassium from Humid Tropical Soils1

  1. C. A. Bower2



Equilibrium between solution and adsorbed K in humid tropical soils leached by rainfall was found to be described by the Langmuir adsorption equation. The product of the two constants in the Langmuir equation k1 and k2, which is equal to the reciprocal of the intercept of the Langmuir isotherm, is a direct measure of the tendency of soil to retain adsorbed K against leaching. Retentivity was greatest in soil containing montmorillonite clay and least in soils derived from volcanic ash having clay dominated by amorphous silicates. Soils whose clay consisted of goethite, gibbsite, and kaolinite were intermediate in retentivity. As a consequence of the applicability of the Langmuir equation, it has also been found that the concentrations of solution and adsorbed K at any depth in the soil as a function of depth of water passing the depth during leaching can be satisfactorily predicted by simplified, approximate solutions of equations derived by Thomas, and Hiester and Vermeulen.

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