Vol. 10, Issue 6 (2021)

Author(s):
Y Chaithanya, B Padmaja, M Malla Reddy and T Srijaya

Abstract:
A field experiment was conducted at Professor Jayashankar Telangana State Agriculture University, Rajendranagar, Hyderabad during rabi 2020-21 to assess the bio efficacy of new generation herbicides in green gram (Vigna radiata). The experiment was assigned ten treatments, laid out in randomized complete block design with three replications. Lower weed density and higher weed control efficiency was recorded with diclosulam 84% WDG @ 26 g a.i ha^-1 as PE fb imazethapyr 10% SL @ 75 g a.i ha^-1 as PoE at 20 DAS and diclosulam 84% WDG @ 26 g a.i ha^-1 as pre-emergence application. However, due to phytotoxicity of herbicide on the crop, it resulted in yield loss. The maximum seed yield was registered with weed free check (1430 kg/ha) and was on par with imazethapyr 10% SL + Quizalofop ethyl 5% EC (tank mix) @ 125 g a.i ha^-1 as post emergence at 20 DAS (1375 kg/ha) and pendimethalin 30% EC + imazethapyr 2% EC combination @ 960 g a.i ha^-1 as pre emergence (1244 kg/ha). Among the herbicide combinations, higher net returns and B:C ratio was recorded with imazethapyr 10% SL + Quizalofop ethyl 5% EC (tank mix) @ 125 g a.i ha^-1 as post emergence at 20 DAS (₹ 68368 /ha, 3.39) followed by pendimethalin 30% EC + imazethapyr 2% EC combination @ 960 g a.i ha^-1 as PE (₹58684/ha, 3.02), respectively.