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Effect of pH on the Cation-Exchange Capacity of Surface Soils¹

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.

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.