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This article in SSSAJ

  1. Vol. 25 No. 2, p. 96-98
    Received: May 2, 1960



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

  1. P. F. Pratt2



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.

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