Journal of Research in Weed Science

Abstract A field experiment was conducted to assess the growth, yield and profitability of wheat under different herbicides application in Kapilvastu and Rupandehi district, Nepal during winter season of 2018. The experiment was laid out in Randomized Complete Block Design (RCBD) with four treatments and five replications. The four treatments comprised of Pendimethalin 30 EC at 3.3 l ha^-1 as a pre emergence herbicide, sulfosulfuron 75 WG at 33.3 g ha^-1 as post emergence, pendimethalin 30 EC at 3.3 l ha^-1 followed by sulfosulfuron 75 WG at 33.3 g ha^-1 and weedy check (control treatment). Results revealed that application of pendimethalin 30 EC at 3.3 l ha^-1 followed by sulfosulfuron 75 WG at 33.3 g ha^-1 significantly reduced the weed population and produced higher wheat grain yield (4487 kg ha^-1). Economic analysis of different herbicides application also showed the highest net returns (NPR. 50,940 ha^-1) for application of pendimethalin followed by sulfosulfuron treatments. Among the tested herbicides, both pendimethalin and sulfosulfuron were found effective to weed management and profitable over weedy check.

Abstract A field experiment was conducted in pre-monsoon season during 2017 and 2018 at National oil seed research program, Nawalpur, Sarlahi, Nepal, to study the impact of weed management practices in groundnut production. Pendimethalin as pre-emergence, while Metribuzin, Propaquizafop at 100 g per hectare, Quizalofop ethyl at 100 g per hectare, as post emergence was used along with integration with hand weeding and intercultural operation. The result revealed that supplement of the hand weeding after the application of the pre-emergence herbicides pendimethalin was found effective in  reducing  the weed severity and improves the growth and yield attributes and ultimately yielded 2101 kg ha^‑1. This treatment also recorded the highest gross and net return (NRs 168080 and 48470) and benefit cost ratio (1.4) thus, this integrated weed management practice could become effective and economic under southern belt terai agro climatic condition of Nepal.

Abstract In modern agriculture, use of herbicides has become indispensable for managing weeds in cultivated lands, due to the scarcity of labors in almost all parts of the globe. Herbicides provide effective weed control in agriculture, yet their continuous and excessive use may pose serious health and environment threats. Pendimethalin is proved to be a very effective pre-emergence herbicide for the control of annual weeds in leguminous and other vegetable crops. Therefore bio-efficacy and residues of pendimethalin were determined in chickpea (Cicer arietinum L.) crop at farmers’ field. Pendimethalin was applied at 796 g ha-1 as a pre-emergence herbicide to control weeds in chickpea fields. Pendimethalin was found effective against weeds viz. Vicia sativa, Convolvulus arvensis, Chenopodium album, and Lathyrus sativa. Terminal residues of pendimethalin were found below