Abstract :
The field experiments were conducted at the research farm of Indian Agricultural Research Institute, New Delhi during rabi season of 2007 and 2008 on a sandy clay loam soil (typical Ustochrept, 51.46% sand, 23.02% silt and 25.52% clay) of medium in organic C, available phosphorus, available potassium and low in available nitrogen and of pH 8. Results revealed that cumulative effects of farmyard manure (FYM) and green manure (GM) were more effective than their direct and residual effects and GM was significantly superior to FYM for increasing the productivity, nutrient uptake, grain quality and gross and net income of rice in rice-wheat cropping system. Further, inoculation of biofertilizers (B) with GM was better than GM alone in its cumulative effect. The combination of GM + FYM was still better than GM and FYM alone in its direct and cumulative effects for increasing productivity and gross return but net return was significantly reduced due to higher cost of GM + FYM than FYM and GM alone. However, residual effect of GM + FYM was similar to cumulative effects of GM and FYM alone. The highest increase in productivity, grain quality and nutrient uptake, was recorded with the application of GM + FYM + B but net return was significantly reduced due to highest cost incurred in the combination of GM + FYM + B. On the basis of results it is concluded that cumulative effect of GM + FYM + B for higher productivity and cumulative effect GM + B for higher net return were found suitable for rice in organic farming of rice-wheat cropping system.
