Dispersion of Clay From Some Salt-Affected, Arid Land Soil Aggregates1
- M. Yousaf,
- O. M. Ali and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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