Laboratory studies on the interacting influence of Sodium Adsorption Ratio (SAR) and electrolyte 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 decreasing electrolyte concentration. At near equivalent ESP and electrolyte concentration greater reductions in hydraulic conductivity were observed in the red soil as compared to black soils. The critical ESP value at which a sudden drop in HC occurred varied from soil to soil. Red soil required higher threshold salt concentration (THC) than black soils at lower ESP values and the reverse was observed at higher ESP values. Dispersion Index (DI) of all soils increased with increase in ESP. The greater the dispersion index of soils, the greater was the reduction in hydraulic conductivity.