Vol. 11, Issue 12 (2022)

Aim: The present investigation was conducted to assess the removal of salts from swell-shrink soil through subsurface drainage.

Methodology: For assessing the salt removal through drainage water an experiment was conducted with different treatments of sub-surface drainage viz., 15, 30, 45 and 60 m spacing and 60, 90 and 120 cm depth. Monthly the leachate samples were collected from June 2001 to July 2002 and analyzed for different salinity parameters.

Results: The maximum concentration of ions in leachate was recorded with 15 m drain spacing at all three depths i.e. 60, 90 and 120 cm. There was no much effect on pH of leachate but the EC of the leachate increased from July 2001 to January 2002 and again showed decreasing trend thereafter upto July 2002 in all the treatments. The Ca2++Mg2+ content was highest in first five leachates and decreased thereafter. The removal of sodium potassium, chloride, bicarbonate and sulphate showed increasing trend from July 2001 to January 2002 and decreased thereafter.

Interpretation: The 15 m drain spacing at all three depths found effective in removal of salts from swell-shrink soil.