Energetics of Greengram (Vigna radiata L.) Production as Affected by Residual Effect of Rice Establishment Methods and Nutrient Management Practices in Rice-Greengram Cropping System

Abstract

Field experiments were conducted. to study the residual effect of three rice establishment methods ( SRI, drum seeding and conventional transplanting) and three nutrient management practices [RDF (80:40:40 N: P2O5: K2O kg ha - 1 ), 50% R.D.F. + 50% R.D.F. through organic sources (based on nitrogen requirement) i.e. INM and 100% RDF through organic management (OM)] and direct effect of three nutrient management practices viz. RDF (20:40:40 N: P2O5: K2O kg ha - 1 ), 50% RDF + Biofertlizer (BF) and no fertilizer on energetics of greengram in a rice - greengram cropping system during rabi seasons of 2009 - 10 and 2010 – 11. The design was split plot in kharif and split - split plot in rabi with treatments replicated thrice. Methods of rice establishment did not influence the yield and energetics of subsequent greengram. Residual effect of sole organic nutrient management being at par with integrated nutrient management came out to be the best in terms of yield and energy indices like energy output, energy productivity and energy ratio . 50% RDF + BF application to greengram recorded the highest seed yield (930 kg ha - 1 ). This treatment also recorded the highest energy output (55.7 MJx10 3 ) , energy productivity (247.3 Kg/MJ x 10 3 ) and energy ratio(14.81).