Vol. 12, Issue 8 (2023)

Author(s):
Maksud Hasan Shah, Bikas Mandal, Dhiman Mukherjee and Santanu Kundu

Abstract:
A field experiment was conducted at the Agricultural D Block Farm, situated in Kalyani, West Bengal. The primary objective of this experiment was effectiveness of employing herbicides as a weed management strategy in transplanted rice cultivation, specifically within the emerging alluvial zone of West Bengal. The experimental evaluations were undertaken during the kharif seasons of both 2020 and 2021. The outcomes unveiled a noteworthy finding. The treatment pretilachlor 50% EC @ 0.70 kg/ha as a pre-emergence followed by conoweeder, succeeded by another application of pretilachlor 50% EC at 0.70 kg/ha as pre-emergence followed by bispyribac-Na 10% SC at 25 g/ha at 25 DAT as a post-emergence intervention, showcased compelling results. This combined approach remarkably delivered a comprehensive and wide-ranging management of weeds. Furthermore, it was associated with the lowest recorded densities and dry weights among the predominant weed species. Pretilachlor 50% EC @ 0.70 Kg/ha PE fb triafamone + ethoxysulfuron @ (44.0+22.5 g/ha) and hand weeding (20 and 40 DAT) also provided better weed control and was comparable to pretilachlor 50% EC @ 0.70 kg/ha PE fb cyhalofop-butyl 5.1% + penoxsulam 1.02% OD @ 112.5 + 22.5 g/ha. (RM). The highest grain and straw yield was recorded under pretilachlor 50% EC @ 0.70 Kg/ha PE fb passing of conoweeder which was comparable with pretilachlor 50% EC @ 0.70 kg/ha PE fb bispyribac-Na 10% SC @ 25 g/ha 25 DAS as POE. The weedy check plots exhibited the highest levels of weed density and dry weight, resulting in the lowest grain yield upon harvesting. Based on the findings, pretilachlor 50% EC @ 0.70 kg/ha PE fb bispyribac-Na 10% SC @ 25 g/ha 25 DAS as POE was the best weed management practices which appeared as effective and safe for managing of broad spectrum weeds & to reduce considerable loss in yield over other weeds management practices.