Bio-efficacy evaluation of premix formulation of sulfentrazone+clomazone against major weeds in soybean.
An experiment was conducted during kharif 2014 and 2015 to evaluate the bio-efficacy of pre-mix formulation of sulfentrazone+clomazone as pre-emergence herbicide for season long weed control and higher productivity of soybean under Vertisols of Malwa region. The experiment was laid out in randomized design with three replications. Two years pooled data revealed that application of pre-emergence or post-emergence herbicides significantly minimized the weeds during the critical period of crop-weed competition. The yield reduction was observed due to weeds was 52.74 per cent. Hand weeding twice at 20 and 40 days after sowing had substantial higher weed control efficiency, which was eventually reflected higher soybean yield. Among herbicidal treatments, maximum weed control efficiency (83.08%) and highest seed yield (2,030 kg/ha) was with imazethapyr @ 100 ga i/ha applied as post-emergence and remained at par with pre-mix formulation of sulfentrazone+clomazone @ 870/725 g a i per ha and all these treatments were significantly superior than clomazone and pendimethalin alone and pre-mix pendimethalin+imazethapyr. The pre-emergence and post-emergence herbicides are found equally effective to manage weeds season long in soybean. The pre-mix formulation of sidfentrazone+clomazone @ 725 g a i per ha was found to be effective against major weeds of soybean.