Weed dynamics in soybean as affected by early-post: Emergence herbicides

Abstract

A field experiment was conducted during kharif season of 2017 at the Research Farm, Department of Agronomy, Jawaharlal Nehru Krishi Vishwa Vidyalaya, and Jabalpur (M.P.). The ten weed control treatments comprising of four doses of fomesafen + fluazifop-p-butyl mixture (90+90, 110+110, 130+130 and 220+220 g/ha), alone application of imazethapyr (100 g/ha), market check – fomesafen + fluazifop-P-Butyl (110 + 110 g/ha), combined application of imazethapyr + imazamox (35 + 35 g/ha) as early post emergence, hand weeding twice at 15 and 30 DAS, weed free and weedy check, were laid out in randomized complete block design with 3 replications. The results indicated that among herbicides, application of premix fluazifop-p-butyl + fomesafen 130+130 g/ha as early-post-emergence recorded lower dry weight of monocot and dicot weeds (0.82 and 0.16 g/m2), respectively, with 99.21% WCE being statistically at par with the highest dose of premix 220+220 g/ha, Hand weeding twice and weed free plots. Higher seed yield (20.12 q/ha) was recorded with application of fomesafen + fluazifop-p-butyl at 130+130 g/ha being at par with hand weeding twice (19.90 q/ha) and weed free plots (20.38 q/ha). The highest dose of fomesafen + fluazifop-p-butyl 220+220 g/ha was found effective against monocot and dicot weeds but caused phytotoxicity on crop and reduced seed yield marginally (19.81 q/ha).