Vol. 5 No. 2
Effect of brown manuring on grain yield and partial factor productivity of nutrients in dry direct seeded summer rice (Oryza sativa L.) under Terai agro-ecological region of West Bengal.
Author(s): S. K. MAITY AND P. K. MUKHERJEE
Abstract: A field experiment was conducted during summer season of 2007 and 2008 for generating information on weed flora and to workout integrated weed management practices with its economics in dry direct seeded summer rice. Among the weed flora grasses like, Cynodon dactylon, Echinochloa crus-galli, Digitaria sanguinalis, Brachiaria ramosa, sedges like Cyperus pilosus, Cyperus iria and broad leaved weeds like Amaranthus viridis, Solanum nigrum, Euphorbia hirta, Commelia diffusa, Phyllanthus niruri, Chinopodium album, Alternanthera sp., Physalis minima, Polygonum pensylvanicum, Polygonum orientale and Polygonum persicarea were recorded during experimentation. Among the integrated weed management practices, butachlor 1.25 kg ha-1 as pre-plant surface application + brown manuring + 2,4-D 0.50 kg ha-1 at 40 days after sowing recorded highest grain yield (4.36 and 4.18 t ha-1) and it was statistically at par with the grain yield (4.44 and 4.22 t ha-1) obtained from long weed free situation. Highest net return (Rs 21954 and 20494 ha-1) and benefit cost ratio (1.30 and 1.22) were also recorded in this treatment during both the years. Therefore, this integrated weed management practice became effective in dry direct seeded summer rice under Terai agro-ecological region of West Bengal. There has been considerable improvement in partial factor productivity of the nutrients due to adoption of weed control practices coupled with nitrogen management and among the integrated weed management practices, partial factor productivity of N (43.60 and 41.80 kg grain yield/kg nutrient applied), P (250 and 239.68 kg grain yield/kg nutrient applied) and K (87.55 and 83.94 kg grain yield/kg nutrient applied) were highest with butachlor 1.25 kg ha-1 + brown manuring + 2,4-D 0.5 kg ha-1 in both the years.
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