Residual effect of organic manure on weed population and nitrogen uptake in greengram under rice-maize-greengram system Ghosh Dibakar1,2,*, Brahmachari Koushik2, Das Anupam3, Sarkar Sukamal4, Dinda Nirmal Kumar5, Moulick Debojyoti6, Datta Madhab Kumar7, Bandyopadhyay Sahuji8 1ICAR-Indian Institute of Water Management, Bhubaneswar, Odisha751023, India 2Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal741252, India 3Bihar Agricultural University, Sabour, Bhagalpur, Bihar813210, India 4School of Agriculture and Rural Development, Faculty Centre for IRDM, Ramakrishna Mission Vivekananda Educational and Research Institute, Ramakrishna Mission AshramaNarendrapur, Kolkata, West Bengal700103, India 5Department of Agriculture, Government of West Bengal, Purandapur, Birbhum, West Bengal731129, India 6University of Kalyani, Nadia, West Bengal741235, India 7Faculty of Agriculture, Sri Sri University, Sri Sri Vihar, Ward-3, Cuttack, Odisha754006, India 8PI Industries Limited, 5th Floor, Vipul Square, B-Block, Sushant Lok, Phase-1, Gurgaon, Haryana122009, India *Corresponding author email: dghoshagro@gmail.com
Online Published on 18 January, 2024. Abstract Intensive cropping system exploits huge amount of costly inputs. Continuous intensification causes a decline in factor productivity and soil health. Apart from the integrated nutrient management, legume inclusions also mitigate the problem. But the weed dynamics in zaid (grown during March to June) legume crop like greengram are not taken care of earlier. This study emphasizes the residual impact of integrated nutrient management with Brassicaceous seed meal (BSM) and neem cake on weed population in greengram under rice-maize-greengram system. Results showed that the major weed flora in summer greengram was Echinochloa colona (L.) Link., Oplismenus composites (L.) P. Beauv., Cyperus rotundus L., Caesulia axillaris Roxb., Phyllanthus virgatus G. Forst., Alternanthera philoxeroides (Mart.) Griseb. and Physalis minima L. The minimum density of O. composites was recorded with BSM and neem cake applied plots. Integrated nutrient management significantly reduced the nitrogen uptake by weeds, hence resullted better crop growth and yield of greengram which was also higher in the treatment where BSM and neem cake was applied. Better weed control and higher greengram yield were obtained with the application of pendimethalin (750 g/ha) as pre-emergence herbicide followed by hoeing at 25 days after sowing under residual fertility of neemcake applied plots. This result emphasized the inclusion of legume crop in the intensive cropping system with residual fertility which does not require any nutrient addition for yield sustainability. Top Keywords Brassicaceous seed meal, Greengram, Neem cake, Weed dynamics, Nutrient uptake. Top |