Impact of propaquizafop on weed growth, yield and economics of soybean (Glycine max L.) under mid hill conditions of Himachal Pradesh

Abstract

For any new technology to be adopted by the growers, it is not only the efficacy but cost is also a concern. In the present investigation impact assessment of propaquizafop alone in combination with other herbicides is done in soybean. Propaquizafop 50g + imazethapyr 100 g/ha followed by post-emergence tank mix combination of quizalofop-ethyl 60g + chlorimuron-ethyl 4 g/ha at 20 DAS gave higher weed control efficiency, crop resistance index and lowest weed index over other treatments. Net returns due to weed control was highest in post-emergence tank mix combination of propaquizafop 50g + imazethapyr 100 g/ha followed by post-emergence tank mix combination of quizalofop-ethyl 60g + chlorimuron-ethyl 4 g/ha. Treatment/herbicidal efficiency index was highest under hand weeding followed by propaquizafop 50g + imazethapyr 100 g/ha at 20 DAS and quizalofop ethyl 60g + chlorimuron ethyl 4g/ha. Based on an overall impact index, propaquizafop 50g + imazethapyr 100 g/ha on 20 DAS followed by quizalofop ethyl 60g + chlorimuron ethy 4g/ha and propaquizafop 75 g/ha applied on 25 DAS in that order are recommended for an effective weed management in soybean under mid hill conditions of Himachal Pradesh.