Adjuvant, Chickpea, Methylated seed oil (MSO), Topramezone, Weed flora, Weed management.

An experiment was conducted at the Agricultural Research Farm, Banaras Hindu University, Varanasi, Uttar Pradesh, India during the Rabi season of 2022-23 and 2023-24 to evaluate the effect of varying rates of topramezone, both alone and in conjunction with methylated seed oil (MSO) adjuvant on complex weed flora and chickpea seed yield. The early post-emergence application (EPoE) of topramezone 20.16 g/ha and 25.20 g/ha with MSO were statistically similar in recording the lowest weed density and biomass, higher weed control efficiency, herbicide efficiency index and lowest weed index. However, all herbicidal treatments tested, except oxyfluorfen 250 g/ha and topramezone 10.08 g/ha, recorded statistically similar chickpea seed yield. In terms of economics, topramezone 20.16 g/ha and 25.20 g/ha with MSO adjuvant recorded statistically similar B:C ratio. Therefore, topramezone 20.16 g/ha is recommended for effective weed control, optimal chickpea seed yield and net profitability in chickpea.