Crop and soil productivity of a rice‐green gram system under integrative nutrient management

Abstract

AbstractA field study was conducted at the Instructional Farm, Odisha University of Agriculture and Technology, Bhubaneswar, Odisha, India, on exploring productivity and soil quality of aromatic rice‐green gram system by dual influence of organic and inorganic sources of nutrients. Among integrated nutrient management practices, 50% NPK + 50% recommended dose of nitrogen (RDN)‐farm yard manure (FYM) to rice produced the highest grain yield (3875 kg ha−1) followed by 75% NPK+ green manure (GM; 3489 kg ha−1). Likewise, residual effect of 50% NPK + 50% RDN‐FYM to rice and application of 75% NPK+ Rhizobium+ phosphate solubilizing bacteria (PSB) to green gram produced the highest seed yield of green gram (812 kg ha−1).Combined application of 50% NPK+ 50% RDN− FYM to rice and 75% NPK + Rhizobium+ PSB to green gram resulted in significantly (p = 0.05) higher system rice equivalent yield (6521 kg ha−1) and production efficiency (31.2 kg ha−1 day−1) while increasing the nutrient uptake of short grain aromatic rice‐green gram system. The highest PFPN (132.7 ± 12.4 kg kg−1) and nitrogen uptake efficiency (0.73 ± 0.06 kg kg−1) were also recorded due to the application of 50% NPK+ 50% RDN‐FYM to rice and 75% NPK + Rhizobium + PSB to green gram (99.0 ± 26.3 kg kg−1, 0.61 ± 0.01 kg kg−1, 1.32 ± 0.40, and 19.5 ± 2.9, respectively). Application of 75% NPK+ GM to rice and 75% NPK + Rhizobium + PSB to green gram significantly (p = 0.05) increased soil organic carbon, available N, P, K, Fe, Mn, Zn, and Cu as well as microbial status of soil.