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- W2009091107 abstract "A field experiment was conducted for 6 years on a Typic Ustochrept to examine the influence of different amounts of gypsum, applied either at each irrigation or in one dose, on the amelioration of deteriorating effects of sodic water irrigations under a fixed rice-wheat cropping cycle. Two sodic waters (SW1 and SW2) having, respectively, electrical conductivities (ec) of 0.85 and 0.95 dS/m, sodium adsorption ratios (sar) of 8.4 and 13.5, and residual sodium carbonates of 6.8 and 10.3 meq/l, were prepared by dissolving NaHCO3 in a good quality canal water. Continuous sodic irrigations increased pH, sar and exchangeable sodium percentage (esp) in the soil and significantly decreased yields of crops as compared with the canal-water (CW) treatment. Harmful effects were higher under SW2. Application of gypsum decreased pH, sar, and esp of the top 0–60 cm soil and hence increased yields of crops. Increase in levels of gypsum progressively decreased the Na saturation of the soil. esp values observed under gypsum, whether applied at each irrigation or in one dose, were almost similar. There was no effect of different rates and methods of gypsum application on wheat yield. In rice, small amounts of gypsum applied in one dose were less beneficial. Gypsum, to supply 2.5 and 5 meq Ca/l of sodic irrigation water for wheat and rice crops, respectively, was sufficient to maintain high yields." @default.
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- W2009091107 date "1989-08-01" @default.
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- W2009091107 title "Effect of gypsum and sodic irrigation water on soil and crop yields in a rice—Wheat rotation" @default.
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- W2009091107 doi "https://doi.org/10.1016/0378-3774(89)90040-1" @default.
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