Effect of chlorimuron-ethyl 25% WP on growth & yield attributes of soybean and against weeds in soybean.

A field experiment was conducted carried out at Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (M.P.) during the kharif season of 2012 to evaluate the weed management practices on soybean. Nine treatments comprised of Chlorimuron-ethyl 12, 24, 36, 48 and 72 g/ha, mechanical weeding (at 20 DAS), weed free treatment (Hand weeding at 20 & 40 DAS) (combined application of chlorimuron-ethyl 24 g/ha + mechanical weeding and weedy check, were laid out in randomized block design with three replications. The plant population of soybean was almost similar under all treatments. Growth parameters like number of branches per plant, plant height, LAI, crop biomass, nodules per plant and active root nodules per plant were significantly superior in treated plots than weedy check. However, weed free treatment was better overall treatments closely followed by T8 (combined application of chlorimuron-ethyl 24 g/ha + mechanical weeding). Yield attributing traits viz. pods per plant, seeds per pod and seed index (100 seed weight) were also remarkably superior under treated plots as compared to weedy check. Among treatments B: C ratio was maximum under T8 Chlorimuron-ethyl 24g/ha +MW (40 DAS) (2.06) followed by T5 Chlorimuronethyl 72g/ha (2.05), and was minimum in T9 Weedy check (1.52).