EVALUATION OF DOSES OF NEW HERBICIDE FLUAZIFOP-P-BUTYL 13.4 EC FOR GRASSY WEEDS MANAGEMENT IN IRRIGATED GROUNDNUT

Abstract

An experiment was conducted to study the effect of new graminicides fluazifop-p-butyl 13.4 EC and quizalofopp-butyl on growth and yield of groundnut in relation to unsprayed control, hand weeding, pendimethalin and imazethapyr. The new graminicides fluazifop-p-butyl at 134 g, 167 g ai/ha and quizalofop-p-butyl 50 g ai/ha (at 20 DAS) lowered the density and growth of grasses (6.3, 4.3 and 6.0 number/m²) considerably as compared to other treatments. All herbicide treatments recorded the significantly higher nutrient uptake in groundnut as compared to unweeded control whereas, unweeded control lowered the nutrient uptake of groundnut by 44% as compared to hand weeding. The total dry matter production per plant found highest in the treatments Fluazifop-p-butyl 167 g ai/ha (23.5 g) and imazethapyr 100 g ai/ha @ 20 DAS (22.8 g) as compared to other treatments.Fluazifop-p-butyl 134 and 167 g ai/ha gave pod yield (1681 and 1542 kg/ha) similar to that of hand weeding (1655 kg/ha) and was on par with imazethapyr 100 g ai/ha @ 20 DAS (1577 kg/ha), pendimethalin 750 g ai/ha @ 3 DAS (1528 kg/ha) and quizalofop-p-ethyl 50 g ai/ha (1485 kg/ha). Unweeded control lowered the pod yield by 56% (720 kg/ha) as compared to hand weeding. The net return and B: C ratio were higher in fluazifopp-butyl 167 g ai/ha (Rs. 37,350 and Rs. 1.25) than hand weeding (Rs. 33,010 and Rs. 0.99). for management of weeds in groundnut, the new post-emergence herbicides namely fluazifop-p-butyl 13.4 EC at 134 g ai/ha, quizalofop-p-ethyl 5 EC at 50 g ai/ha (both graminicide at 20 DAS for control of grasses) and imazethapyr 10 SL at 100 g ai/ha (20 DAS, for broad spectrum weed control) appeared good from the point of yield and economics.