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The Gapon Coefficient and the Exchangeable Sodium Percentage-Sodium Adsorption Ratio Relation¹

ABSTRACT

A recent, corrected thermodynamic equation for the Gapon cation exchange selectivity coefficient produces a relation between the exchangeable sodium ratio (ESR) and the sodium adsorption ratio (SAR) that is indistinguishable from the widely used, empirical ESR-SAR relation when SAR 40. In this sense, the thermodynamic theory of cation exchange is consistent with the empirical ESR-SAR relation over the range of SAR values that has practical importance in the management of sodium-affected soils.

¹ Contribution from the U. S. Salinity Laboratory, USDA-AR-SEA, Riverside, CA 92501 and the Dep. of Soil & Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Soil Scientist, U. S. Salinity Laboratory, and Professor of Soil Science, Univ. of California, Riverside, respectively.

Received for publication June 4, 1979. Accepted for publication October 23, 1979.