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One of the options to ameliorate the deleterious effects of sodic water irrigation is to apply gypsum to soil. We examined whether the application of organic manures or crop residue can reduce the need for gypsum in calcareous soils. A long-term field experiment with annual rice–wheat cropping rotation was conducted for 15 years (1991–2006) on a non-saline calcareous sandy loam soil (Typic Ustochrept)...
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