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Abstract:A field experiment was conducted on vertisols at Organic Farming Research Institute, University of Agricultural Sciences, Raichur coming under northern Karnataka during rabi season of 2015-16 to study the yield potential (q ha -1 ) and economics of rabi sorghum (Sorghum bicolor L.) as influenced by different crop residues and green biomass composts. The experiment consisted of fifteen treatments, of which twelve treatments were based on nitrogen supply though different composts, one recommended dose of fertilizer, one recommended organic and inorganic fertilizers and another was absolute control. Significantly higher grain yield (39.9 q ha -1 ) and stover yield (13.2 tha ). Significantly higher B:C (3.08) was recorded with RDF(50:25 N:P 2 O 5 kg ha -1 ) + FYM @ 3 t ha -1 application followed Cotton stalks +Redgram stalks + Glyricidia sp. with C: N ratio of 30:1 compost @ 50 kg N equivalent (T 12 :2.90) over other treatments. Application of recommended FYM @ 3 t ha -1 15 days before sowing along with 50 kg of nitrogen and 25 kg of phosphorus per hectare at the time of sowing recorded higher dry matter production, grain and stover yield and net returns and benefit: cost ratio.

A field experiment was conducted on vertisols (pH of 7.56 with organic carbon content of 0.55%) at Research Institute on Organic Farming, University of Agricultural Sciences, Raichur coming under northern Karnataka during rabi season of 2015-16 to study the Influence of varied crop residues and green biomass composts to rabi sorghum growing soils on uptake of major nutrients, organic carbon and soil fertility status. In general application of Cotton stalks, Redgram stalks, Glyricidia, combination of cotton and redgram stalks composts, FYM and combination of organic and inorganic fertilizers helped to buildup soil nutrients with respect to organic carbon, available nitrogen and phosphorus. Significantly higher nitrogen (227.3 kg ha