Energetic Evaluation of Integrated Nutrient Management for Nitrogen in Kharif Rice and its Residual Effect on Yellow Sarson

Abstract

The field experiment was conducted during kharif and rabi seasons of 2015-16 and 2016-17 to study energetics of integrated nutrient management (INM) practices in rice and subsequent Yellow Sarson grown under residual nitrogen (N) in soil. Different energetic parameters were estimated individually for rice, Yellow Sarson and over the rice-Yellow Sarson together. The experiment was laid out in randomized block design with eight treatments including six INM practices, one chemical practice and one control (i.e. no N) with three replications. The results revealed that INM practices involving 25% replacement of N through green manuring or brown manuring with dhaincha and 50% replacement of N through organics (FYM and Azolla dual cropping) came out to be best in terms of energy indices like energy output, energy productivity and energy ratio. The practice of 75% N as chemical fertilizer with dhaincha brown manuring recorded the highest energy output (218.7MJ × 103), energy productivity (209.7 Kg MJ-1 × 103) and energy ratio (14.81).