The hydraulic conductivity (HC) decreased with an increase in RSC (residual sodium carbonate) at a given BAR and BC of the leaching waler. The hazardous effect of high RSC further increased with an increase in SAR and decrease in EC of the irrigation water. The adverse effect of high RSC at low SAR on HC was practically the same as affected by low RSC at high SAR. Further the harmful effect of high RSC water on HC was greater than that of the same level of alkalinity. Soil pH and ESP increased significantly with an increase in RSC and its adverse effect became additive at high SAR. RSC of the soil extracts was greater than the RSC of the leaching water. As a result Of this, adsorption of Na+ increases significantly, resulting thereby in the poor hydraulic properties of the soil. Further, pH of the leachate is lower than the pH of the soil solution. Soil salinity build up increased with the increase in the salinity of the water at a given SAR but. the salinity hazard increased further with an increase in SAR of the leaching water. The Gapon's selectivity coefficient for different treated soils increased with an increase in salinity and sodicity hazards. The highest KG value was observed at high SAR. RSC and BC of the equilibrating solutions.
Leaching, SAR, RSC and EC of water, properties
