ECONOMICS, EVALUATION OF DIFFERENT SOURCES AND LEVELS OF ORGANICS FOR SUSTAINABLE PRODUCTION UNDER CEREAL- CEREAL CROPPING SYSTEM IN MAHARASHTRAPatil, N.S. Ugale, S.M. Todmal and A.V. Khairnar
A field experiment is being conducted since 1984 with integrated nutrient supply to sorghum- wheat system in vertisols to study, the contribution of organic manures to nitrogen economy and sustainability of soil fertility and productivity with 12 treatments Viz. Control, SO % RDF, 75 % RDF, 100% RDF, 50 % RDF + 50% N through FYM., 75 % RDF + 25 % N through FYM, 50 % RDF + 50 %WCS, 75 % RDF + 25 % N through WCS, 50 % RDF + 50 % N through green manuring, 75 % RDF + 25 % N through green manuring and last is farmers practice ( 45 kg N :20 kg P205 kg/ha) in randomized block design with four replications,farm yard manure (0.54 % N),green manuring (Glyricidia 2.73 % N), wheat cut straw (0.46% N ) were incorporated into the soil before sowing of the crop. Nitrogen, Phosphorus, and Potassium was applied as per the recommended dose of fertilizers through urea, single super phosphate and Muriate of potash. In sorghum wheat sequence, maximum productivity was obtained urder treatment involving use of 50 % RDF in conjunction with 50 % N through FYM in terms of sorghum grain equivalent ((98.93 q/ ha).Addition of organic manure spectacularly increased crop productivity as compared to sub optimum dose of fertilizer.Gross and net returns as well as B:C ratio was also similar in the same treatment. On pooling the data from 1984-2005 indicated similar trends of results. Sub optimum doses of chemical fertilizer alone could not sustain in long run under sorghum- wheat sequence. Maximum SY1 for sorghum grain ((0.71) was recorded due to application of 50 % RDF + 50 % N through FYM to sorghum crop in kharif. Continuous application of organic manure in conjunction with inorganic fertilizers maintains / improved organic carbon and available Nitrogen in the soil.
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