Effect of different post-emergence herbicides on weeds, crop yield and economics of greengram grown in rainy season

摘要

A field experiment was conducted at field unit of AICRP on Agro-forestry, University of Agricultural Sciences, GKVK, Bengaluru during Kharif (rainy season) 2018 to study the effect of different post-emergence herbicides on weeds, crop yield and economics of Kharif greengram. Eleven treatments including the application of three post-emergence herbicides (fomesafen, propaquizafop and imazethapyr) and their combinations at 25 days after seeding (DAS), hand weeding (HW) twice at 15 and 30 DAS, weed freecheck and un-weeded control were replicated thrice in randomized complete block design. The post-emergence application (PoE) of fomesafen + propaquizafop 294 + 91 g/ha and fomesafen + propaquizafop 252 + 78 g/ha resulted in significantly lower weed biomass at 45 DAS (11.65 and 12.78 g/m~2, respectively) and at harvest (15.59 and 18.69 g/m~2, respectively) due to reduced weed density at 45 DAS (21.5 and 23.4 no./m~2, respectively) and at harvest (15.90 and 18.01 no./m~2, respectively). These treatments have recorded higher weed control efficiency and lower weed index (71.6, 6.21 and 69.09, 10.73, respectively). Among the various herbicide treatments, significantly, highest greengram seed yield (1058 kg/ha) was recorded with post-emergence application of fomesafen + propaquizafop 294 + 91 g/ha.