Ladoratory studies on the interacting influence of Sodium Adsorption Ratio (SAR) and electrolye concentration on soil hydraulic conductivity (HC) and dispersion on two black and one red soils of Karnataka indicated that the hydraulic conductivity of soils decreased with increasing ESP and decreating electrolyte concentration. At dear eguivalest ESP and electrolyte concentontion, the greater reductions in hydraulic conductivity were observed in red soil as compared to black soils. The critical ESP value at which a sudden drop in HC occured varied from soil to soil. Red soil required higher threshold salt concentration (THC) than black soils at lower ESP values and vice-versa. was observed at higher ESP values. Dispersion Index (DT) of all soils increased with increase in ESP. The greater the dispersion index of soils, the greater was the reduction in hydraulic conductivity.
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