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This article in SSSAJ

  1. Vol. 28 No. 4, p. 490-492
    Received: Nov 1, 1963



The pH-Percent Base Saturation Relationships of Soils1

  1. J. S. Clark and
  2. R. G. Hill2



The curves obtained by plotting pH-½p (Ca + Mg) against percent base saturation calculated from the ratio of exchangeable Ca + Mg to the sum of Ca + Mg + Al + H extracted from soils with 1.0N KCl had the characteristic shapes of clay titration curves. The experimental values for some montmorillonitic soils showed close agreement with the theoretical curve calculated for Al-bentonite. The Podzolic and Glei soils fell along another curve with lime potential values higher than those for the montmorillonitic soils at the same % base saturation indicating that the exchange properties of the soils differed from those of bentonite. No close relation was observed when the cation-exchange capacity (CEC) obtained with 0.9N Ca(OAc) 2 + 0.1N CaCl2 or with 1.0N CaCl2 was used to calculate percent base saturation.

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