Weed Management in Soybean through Post Emergent Herbicides

Weed infestation is a complex and regular threat to soybean production all over the world. Successful weed control is most important factor for fruitful soybean production, because losses due to weeds have been one of the major limiting factors in soybean production. Hence a study was carried out using post emergent herbicides at College of Agriculture,Raichur.during kharif 2020 and 2021.The experiment was laid in randomized complete block design with three replications, and it consists of twelve treatments ( viz., Clorimuron ethyl @ 37.5 g a.i, Imazethapyr + Imazamox @ 100 g a.i, Propaquizafop + Imazethapyr @ 100 g a.i, Profoxydim (at three doses viz., 35, 55 and 75 g a.i and another three set of these doses were added with adjuvant @ 2ml/liter of water), Propaquizafop @ 75 g a.i., and weed free check and weedy checks were also maintained. Results were indicated that among the herbicide treatments, combi products viz.,Imazethapyr + Imazamox @ 100 g a.i, Propaquizafop + Imazethapyr @ 100 g a.i. suppressed the weed density effectively and increased the weed control efficiency (88.41 % and 84.14%) next to weed free check. Yield parameters like number of pods per plant, test weight and grain yield also recorded higher in Imazethapyr + Imazamox @ 100 g a.i. (31.93,82.19g and 1622 kg ha-1) among the herbicides tested. BC ratio was recorded significantly higher in Imazethapyr + Imazamox @ 100 g a.i.(3.29) and it was on par with weed free check(3.22). From this trial, it can be concluded that broad spectrum or combi products like Imazethapyr + Imazamox can be used as a effective post emergent herbicide in soybean to suppress both monocot and dicot weeds