Effect of test solution composition on the hydraulic conductivity of normal and saline-sodic soils

Laboratory and field studies were conducted to find out the effect of test solution composition on the hydraulic conductivity of different soils. Results show that the nature and degree of permeability changes, differ with soil texture, nature of exchangeable cations and composition of the saturating solution. Hydraulic conductivity was more stable in a sodic-soil of heavier texture as compared to soils of lighter texture which underwent drastic changes in permeability. These differences were probably because of the ease with which dispersion or formation of floccules took place in different soils. The results bear out the possibility of using poor quality irrigation waters for the reclamation of saline-sodic soils. Application of a calcium amendment will, however, be most desirable to maintain reasonable permeability for removing excess salts.