摘要 : A field experiment was conducted during <i>kharif</i> season to study the effect of integrated organic sources of nutrients on rice productivity and profitability. The soil of experimental site was red sandy loam, with having soil... 展开 A field experiment was conducted during <i>kharif</i> season to study the effect of integrated organic sources of nutrients on rice productivity and profitability. The soil of experimental site was red sandy loam, with having soil organic carbon content of 0.63%. The field trial consisted of eight treatments laid out in randomized complete block design with three replications. The sources of organic manures used in the trial to supply the nutrients were farmyard manure, vermicompost and cow urine. The analysis of organic substrates indicated that the highest organic carbon content of 29.43% was noticed in sheep manure followed by pressmud (27.20%), vermicompost (21.75%), poultry manure (20.85%), pig manure (17.20%), FYM (16.43%) and the lowest was observed in crossbreed urine (0.79%). The experimental results indicated that the application of 15 tons of farmyard manure as basal dose and top dressing with 75 kg of nitrogen through cow urine on nitrogen equivalent basis recorded significantly the highest grain yield of 5,138 kg/ha followed by 10 tons of farmyard manure as basal dose and top dressing with 75 kg of nitrogen through vermi-compost (4736.13 kg/ha) and found superior over other treatments. The lowest grain yield was observed with the application of farmyard manure at 10 tons per hectare as basal dose and top dressing with 50 kg nitrogen through cow urine (4,305.56 kg/ha). The highest gross returns, net returns and benefit cost ratio were achieved from the crop receiving 15 ton farmyard manure as basal dose and top dressing 75 kg nitrogen through cattle urine (Rs 62,028, 39,907 and 2.21 respectively) which was higher than other treatments and the lowest cost of production was observed with the application of farmyard manure at 10 t/ha as basal dose and top dressing with 50 kg N/ha through cattle urine. The soil organic carbon content increased significantly in the plots treated with organics (0.64-0.72%) over the initial soil organic carbon of 0.63%. Soil available nutrient status improved significantly with farmyard manure applied at 15 t/ha as basal dose and top dressed with 75 kg nitrogen per ha through cattle urine than the initial soil nutrient status. 收起