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This article in SSSAJ

  1. Vol. 36 No. 1, p. 174-175
    Received: July 23, 1971
    Accepted: Sept 22, 1971

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Fractionation of Cation Exchange Capacity for Assessing Soil and Water Sodicity1

  1. C. A. Bower and
  2. J. D. Rhoades2



High vermiculite, arid zone soils whose cation exchange capacities (CEC) decrease more than 45% by K fixation have higher than usual regression coefficients for the relation between their exchangeable-sodium ratio (ESR) and sodium-adsorption ration (SAR). The regression coefficients are approximated by the equation: regression coefficient of ESR/SAR relation = (0.00043 × percentage decrease in CEC upon K fixation ) - 0.0045. For eight soils having a wide range of vermiculite contents, the exchangeable-sodium percentage required to cause a 25% reduction in hydraulic conductivity at a salt concentration of about 10 meq/liter was highly correlated (r = 0.95) with CEC after K fixation.

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