Abstract
A laboratory experiment with five saline-sodic soils having different 5AR values was performed to determine the effects of' different amendments on hydraulic conductivity, water permeability and degree of dispersion of these soils. Gypsum was applied at rates of 50, 75 and 100 % of gypsum requirement. Farm yard manure (FYM) and green manure (GM) of Sesbania Waves were applied at rates of 15 and 25 t acre while single super-phosphate (55P) Fertilizer was added at the rate of 80 kg acre The soil samples mixed with gypsum and SSP were incubated for one month while the samples treated with FYM and GM were incubated for 75 days. Increasing rate of SAID generally caused a corresponding reduction in hydraulic conductivity and intrinsic permeability but increased the degree of dispersion. All treat-ments produced significant effect on the values of these parameters. Application of gypsum resulted in an increase in hydraulic conductivity, in per and in a decrease in the degree of dispersion. This effect was generally directly proportional to the rate of gypsum applied. Chemical amendments were more effective than FYM and GM, area among amendments, gypsum proved better than SSP fertilizer in improving physical conditions of saline-soidic soils.
