Author(s):

Arvind Ahirwal, Nisha Sapre, Vikash Singh and Preeti Sharma

Abstract: The field experiment entitled “Efficacy of pyroxasulfone 5% + pendimethalin 40% ready mixture on associated weed flora, growth and yield of soybean (CV JS 20-29)” was conducted at Research Farm, Department of Agronomy, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (Madhya Pradesh) during growing season’s Kharif 2017. The eight treatments comprising of four doses of pyroxasulfone + pendimethalin mixture (450, 675, 900 and 1125 g ha^-1), alone application of pyroxasulfone (100 g ha^-1) & pendimethalin (750 g ha^-1) as pre-emergence and hand weeding twice at 20 and 40 DAS including weedy check, were laid out in randomized block design with three replications. Hand weeding twice at 20 and 40 DAS recorded the lowest weeds intensity and weeds biomass followed by pyroxasulfone + pendimethalin at 900 g ha^-1and these treatments significantly reduced the weeds intensity and weeds biomass (3.29 g m^-2) over rest of the herbicidal treatments and weedy check. Among the herbicidal treatments, application of pyroxasulfone + pendimethalin mixture at 900 and 1125 g ha^-1 as pre emergence arrested the weed biomass production remarkably and proved superior to its lower dose (450 g ha^-1), alone application of pyroxasulfone (100g ha^-1) and pendimethalin (750 g ha^-1). The seed yield and gross monetary returns were maximum in hand weeding treatment among all the treatments, but net monetary return and B:C ratiowere the highest (Rs 15182 ha^-1 and 1.53, respectively) under combined application of pyroxasulfone + pendimethalin at 900 g ha^-1closely followed by pyroxasulfone + pendimethalin at 1125 g ha^-1 as pre emergence to soybean.

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