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Soil Science Society of America Journal Abstract -

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


This article in SSSAJ

  1. Vol. 44 No. 2, p. 258-260
    Received: June 4, 1979
    Accepted: Oct 23, 1979

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  1. J. D. Oster and
  2. Garrison Sposito2



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.

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