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Published in Soil Sci Soc Am J 28:199-202 (1964)
© 1964 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of pH on Potassium Fixed by an Irreversible Adsorption Process1

A. L. Page and T. J. Ganje2

ABSTRACT

The irreversible adsorption of K by soils, vermiculite, and illite under moist conditions was studied over a range of pH 3 to 8. The amounts of K irreversibly adsorbed by the vermiculite and soils that contained biotite-weathering products were independent of the soil- or clay-solution equilibrium pH as long as the concentration of Al in the systems was kept low. The results were interpreted to indicate that K, which is fixed by irreversible adsorption, is associated only with the permanent charge component of the exchange complex.

Acid-leaching the soils destroyed their capacity to irreversibly adsorb K from KCl solution at pH 3 and markedly reduced their exchange capacities at the same pH. The acid-leached soils contained relatively large concentrations of base-titratable Al, which were nonreplaceable with either 1.0N NaCl or 1.0N KCL. Therefore, the results indicate that difficultly replaceable Al on the exchange sites of the acid-leached soils prevented the adsorption of K on sites which were capable of irreversibly adsorbing it.

NOTES

1 Paper No. 1492, University of California, Citrus Research Center and Agr. Exp. Sta., Riverside. Presented before the Western Society of Soil Science, Stanford, Calif., June 18, 1963.

2 Assistant Professor of Soil Science and Laboratory Technician, respectively.

Received for publication July 5, 1963. Accepted for publication September 19, 1963.






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