Evaluation of efficacy of post-emergence herbicides in soybean (Glycine max)

A field experiment was conducted at the research farm of the university during rainy (kharif) season 2001 and 2002 to evaluate the efficacy of post-emergence herbicides against weeds in soybean [Glycine max (L.) Merr.]. Among the weeds, the grassy weeds were predominant (69%) in the experimental field compared with broad-leaf weeds (31%). Post-emergence application of haloxyfop ethoxy-ethyl at 50 g/ha or higher rates (75 and 100 g/ha) gave effective control of grassy weeds only. Imazethapyr at 75 g/ha controlled only broad-leaf weeds. Haloxyfop ethoxy-ethyl (50 g/ha) controlled grassy weeds better and gave yield-attributing traits and yield comparable to those of hand-weeding and proved more remunerative than imazethapyr 75 g/ha as well as handweeding treatment.