Economics, Groundnut, Post-emergence herbicides, Weed control efficiency, Weed index

A field experiment was conducted at Agricultural Research Station, Kawadimatti, Karnataka during Kharif 2012 and 2013 to study the efficacy of post-emergence herbicides for weed management in groundnut. The trial comprised of eight treatments, out of which five treatments were of post-emergence herbicides, viz. quizalofop-ethyl, propaquizafiop, imazethapyr, chlorimuron-ethyl, fenoxaprop-p-ethyl. These were compared with, pre-emergence spray of pendimethalin weed free and weedy treatments. Among the post-emergence herbicides, significantly higher pod yield (2.01 t/ha) was recorded with  imazethapyre, which was at par with quizalofop-ethyl (1.91 t/ha) and propaquizafop (1.87 t/ha). Imazethapyre also recorded higher net return (Rs/ha) and B:C ratio. Higher pod yield of these treatments was due to significantly lower total weeds density, weed biomass and higher weed control efficiency.