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Influence of summer legume residue recycling and varietal diversification on productivity, energetics, and nutrient dynamics in basmati rice–wheat cropping system of western Indo-Gangetic Plains

Pooniya, Vijay, Choudhary, Anil K., Bana, R. S., Sawarnalaxmi, K., , Pankaj, Rana, D. S., Puniya, M. M.
Journal of plant nutrition 2018 v.41 no.12 pp. 1491-1506
costs and returns, energy efficiency, fallow, field experimentation, genotype, grain yield, microbial biomass, mung beans, profitability, recycling, rice, soil, soil organic carbon, summer, wheat, India, Indo-Gangetic Plain
A field experiment was conducted on summer mungbean residue recycling (SMBRR) and basmati rice–wheat cropping system (BRWCS) at New Delhi, India. The SMBRR enhanced the system productivity and net returns by ∼19.1% and 22.1% compared to summer fallow (SF) with highest magnitude under genotypic sequence of P 2511/HD 2967. Two genotypes each in basmati rice (PB 1 and P 2511) and wheat (HD 2967 and HD 2733) responded well to SMBRR with respect to grain yield efficiency index (GYEI) ≥ 1.0. SMBRR also registered ∼13.5% higher microbial biomass carbon (MBC) than SF. Soil organic carbon (SOC) storage also increased by ∼6.8% in 0–30 cm soil layer. The rice–wheat–summer mungbean system produced significantly highest energy efficiency compared to the rice–wheat–summer fallow system with highest values under genotypic sequence of P 2511/HD 2967 as a result of better yield expression. Overall, SMBRR with suitable genotypic sequence improved the system productivity, profitability, and nutrient dynamics in BRWCS, which are vital for long-term sustainability of this system.