Author(s): K. MONDAL, G. C. MALIK, K. JANA AND M. BANERJEE

Abstract: A field experiment was conducted during the pre-kharif (dry) season of 2016 at the Farmers field of Lohagarh village, Sriniketan, Birbhum, West Bengal with rice variety "MTU 1010" to study the performance of herbicides on weed growth and productivity of dry season transplanted rice. The experiment was laid out in randomized complete block design comprising of nine treatments with three replications. The experimental outcome revealed that rice was infested with three categories of weeds viz. sedge, grass, and broadleaf weeds. Mainly Panicum repens, Echinochloa crusgalli weeds were dominated in the experimental plot. Among the herbicide treatments, pyriftalid + bensulfuron methyl @ 900 ml ha-1 at 9 DAT (T6) recorded the lower weed population as well as dry weight of sedges, grasses, and broadleaved and total weeds but it was at par with pyriftalid + bensulfuron methyl @ 450 ml ha-1 at 9 DAT (T5) followed by pretilachlor 6% + bensulfuron 0.6% @ 10 kg ha-1 at 3 DAT (T9) was also quite effective in controlling broad spectrum weeds. Lower values of weed density, total weed dry weight and weed index was recorded at pyriftalid + bensulfuron methyl @ 900 ml ha-1 at 9 DAT (T6) treatment and also higher values of growth, yield of rice, weed control efficiency, net return as well as return per rupee invested were registered with application of pyriftalid + bensulfuron methyl @ 450 ml ha-1 at 9 DAT (T5). The loss of grain yield of rice due to weed infestation was about 49%. Application of pyriftalid + bensulfuron methyl @ 900 ml ha-1 at 9 DAT (T6) was found to be the best dose of herbicide but it was at par with the application of pyriftalid + bensulfuron methyl @ 450 ml ha-1 at 9 DAT (T5) for managing weeds, obtaining higher yield (5.29 t ha-1) and net return of transplanted pre-kharif rice in the red and lateritic belt of West Bengal.

DOI: 10.22271/09746315.2020.v16.i3.1371

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