Abstract
Laboratory experiments were conducted to study organic matter (OM) loss from soil columns with different clay mineral composition and treated with high sodium (Na) and potassium (K) saline solutions (SAR and Removal of organic and inorganic colloids was evaluated by determining organic matter content in the soil at the end of the trial and measuring absorbency of the percolated solutions. Though clay dispersion after magnesium (Mg) treatment was marked in the case of illitic and smectitic soils, little effect was detected in kaolinitic soil. For treatments with solutions containing Na, the highest removal of organic colloids was observed in illitic and kaolinitic soils. In smectitic soil this effect was more pronounced with calcium (Ca) in combination with Na and K. These findings have significance to explain differences in OM mobilization in salt affected depressions of different composition.
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