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This article in SSSAJ

  1. Vol. 51 No. 4, p. 920-924
    Received: May 29, 1985

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Dispersion of Clay From Some Salt-Affected, Arid Land Soil Aggregates1

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



The dispersion characteristics of five arid land soils were determined upon reaction with solutions having various levels of electrolyte concentration, C (C = 0, 1, 4, 10, 30, 50, and 100 mmolcL−1), and sodium adsorption ratios, SAR (0, 5, 10, 20, and 40) with either Ca or Mg as the divalent counter-ion. With either divalent cation, clay dispersion increased as SAR increased and C decreased. Greater dispersion was observed with Mg as the divalent counter-ion due to the higher SAR and lower C levels, which resulted in the Mg systems compared to the Ca systems when the soils were reacted with comparable SAR and C treatment solutions. Dispersion threshold relations are concluded to be a useful criterion for screening soils for their sodicity hazard potentials.

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