Economic evaluation of sub surface drainage system under Tungabhadra irrigation command

Abstract

The work was conducted for two years (2020-21) to check the efficacy of different spacing of SSD system on soil quality parameters, land and crop performance in Tungbhadra irrigation command, Karnataka. The SSD system was laid in 7.0 ha plot with two treatments which consisted of different SSD (Subsurface drainage) spacing viz., 50 (3.0 ha) and 60 m (4.0 ha) each with a depth of 1.0 m. After installation of SSD system the lands were improved by resulted the maximum reduction in soil salinity was observed under 50 m drain spacing than 60 m and thereby increases in paddy yield of 58.7 and 50.3 percent under 50 and 60 m spacing respectively. Looking into economics part of the SSD system like the investment and returns, Benefit-Cost ratios was greater than one with positive NPV, greater IRR and lesser payback period, indicating that the investment on SSD system profitable even though the investment was high on reclaiming saline soils.