Assessment of irrigation water quality of agriculture technical school, Manjri farm, Pune

Abstract

A survey was undertaken during the year 2018. Total 72 water sample were collected in three seasons, pre−monsoon (April−2018), monsoon (August−2018) and post− monsoon (October−2018) season and analyzed for pH, electrical conductivity (EC), cations (Ca2+, Mg2+, Na+ and K+), anions (CO 2−, HCO −, Cl− and SO 2−), heavy metals 3 3 4 (Ni, Cd and Cr) and water quality indices like sodium adsorption ratio (SAR), residual sodium carbonate (RSC) and Kelley's ratio (KR). The pH and EC of irrigation water samples varied from 7.34 to 8.56 (7.93), 0.29 to 0.68 (0.48) dSm−1, 7.19 to 7.51 (7.31), 0.21 to 0.54 (0.36) dSm−1 and 7.13 to 7.35 (7.22), 0.18 to 0.51 (0.33) dSm−1, respec- tively. The relative abundance of major ions for most of the water samples were Ca2+ > Mg2+ > Na+> K+ for cations, SO 2− > Cl− > HCO − > CO 2− for anions and Cr> Cd > Ni for 4 3 3 heavy metals. The SAR and KR of irrigation water samples varied from 0.81 to 1.21 (1.01), 0.26 to 0.32 (0.29), 0.66 to 0.88 (0.79), 0.23 to 0.35 (0.28) and 0.56 to 0.81 (0.70), 0.20 to 0.33 (0.26), respectively. Correlation matrix indicated that pH and EC were highly correlated with Na+, Ca2+, Mg2+, K+, Cl−, HCO −, SO 2−, Cd and SAR. In 3 4 general, the analysis of various parameters indicated that quality of irrigation water showed good on the basis of salinity hazard, sodium hazard, bicarbonate hazard and KR, but toxic in Cd and Cr content.