INFLUENCE OF INTEGRATED NUTRIENT MANAGEMENT IN RICE (ORYZA SATIVA) ON PERFORMANCE OF WHEAT (TRITICUM AESTIVUM) UNDER LONG TERM RICE-WHEAT CROPPING SYSTEMShivani Ranjan, Sumit Sow, Sanjay Kumar and Swaraj Kumar Dutta
The concern to increase the production along with maintenance of environmental sustainability is increasing day by day. A long-term field experiment (since 1984) comprising of eleven treatments with different combinations of inorganic and organic fertilizers such as farm yard manure (FYM), wheat straw and Sesbania aculeata as green manure (GM) was conducted during the rabi season of 2020-21 at research farm of Bihar Agricultural University, Sabour, Bhagalpur to assess the impact of variable integrated nutrient management (INM) in rice (Oryza sativa) and inorganic nutrient management in wheat on leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR) and dry biomass of wheat (Triticum aestivum). The results revealed that maximum LAI (0.54, 2.34, 3.05 and 2.43), dry biomass (104.4, 312.5, 663.1, 858.5 and 967.2 g m-2) and CGR (6.94, 11.68 and 6.51 g m-2 day-1)at different intervals were found with application of 50% recommended dose through fertilizers (RDF) in rice and 50% inorganic N (nitrogen) by FYM followed by 100% RDF in wheat. In case of NAR, during 30-60 DAS it was found highest (6.80 g m-2 day-1) with 50% RDF in rice and 100% RDF in wheat but at 60-90 DAS (4.36 g m-2 day-1) and 90-120 DAS (3.06 g m-2 day-1) it was maximum with application of 50% RDF and 50% N through FYM in rice and 100% RDF in wheat. Therefore, application of 50% RDF in rice and substitution of 50% inorganic N by FYM followed by 100% RDF in wheat can improve growth of wheat in long term rice-wheat cropping system with reduced environmental hazard.