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This article in SSSAJ

  1. Vol. 51 No. 4, p. 896-900
    Received: May 29, 1985

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Effect of Exchangeable Cation and Electrolyte Concentration on Mineralogy of Clay Dispersed from Aggregates1

  1. O. M. Ali,
  2. M. Yousaf and
  3. J. D. Rhoades2



The type of clay dispersed from aggregates of various arid land soils as influenced by sodium adsorption ratio (SAR) and electrolyte concentration was evaluated in Ca-Na and Mg-Na systems. It was observed that, in general, in the case of Fallbrook I, Fallbrook II, Pachappa, and Arlington soils, all the common clay minerals (kaolinite, clay mica, vermiculite, and montmorillonite) dispersed whenever disaggregation occurred inrrespective of SAR and electrolyte concentration levels. In Bonsall soil, kaolinite and mica clays were apparently more dispersive than montmorillonite, which, in turn, was more dispersive than mixed layer clays in Ca-NaCl solutions. More intense x-ray diffraction peaks were obtained, in general, in the Mg-Na system compared to the Ca-Na system.

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