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Published in Soil Sci Soc Am J 25:96-98 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of pH on the Cation-Exchange Capacity of Surface Soils1

P. F. Pratt2

ABSTRACT

A method of measuring the pH-dependent cation-exchange capacity of soils is described and data for 15 surface soils are presented and discussed.

The pH-dependent cation-exchange capacity was found to be equivalent to the exchange acidity not displaced by a neutral KCl solution but displaced by buffered BaCl2-triethanolamine solution. The average contribution of the organic C and clay to the pH-dependent cation-exchange capacity of the soil was 370 and 15.6 me. per 100 g. of the respective materials.

NOTES

1 Paper No. 1240, University of California Citrus Exp. Sta., Riverside.

2 Associate Chemist, Department of Soils and Plant Nutrition.

Received for publication May 2, 1960. Accepted for publication May 28, 1960.






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Copyright © 1961 by the Soil Science Society of America.