Author(s):

Devi Lal Dhaker, Birendra Kumar, Arnab Roy Chowdhury and Rayapati Karthik

Abstract: A field experiment was conducted during Kharif season of 2018-19 at Agriculture Research Farm, Bihar Agriculture University, Sabour, Bhagalpur to assess the bioefficacy of different herbicides and their combinations for weed control as well as their relative influence on profitability in direct dry-seeded rice cultivation. The minimum weed index (1.69%) was recorded under herbicidal treatment T₅ (Pyrazosulfuron @ 25 g a.i. ha^-1 PE fb Bispyribac sodium @ 20 g a.i. ha^-1 + Pyrazosulfuron @ 20 g a.i. ha^-1 POE) whereas, the maximum weed index (36.39%) was recorded under T₂ (Pendimethalin @ 1000 g a.i. ha^-1 PE). Among different herbicidal treatments, the maximum weed control efficiency was recorded under T₅ (Pyrazosulfuron @ 25 g a.i. ha^-1 PE fb Bispyribac sodium @ 20 g a.i. ha^-1 + Pyrazosulfuron @ 20 g a.i. ha^-1 POE) treatment at 45 and 60 days after sowing, the minimum weed control efficiency (69.00%) was observed in treatment T₂ (Pendimethalin @ 1000 g a.i. ha^-1 PE). Maximum net return (Rs. 62401 ha^-1) and benefit: cost ratio (1.95) were obtained from the treatment T₅ (Pyrazosulfuron @ 25 g a.i.ha^-1 PE fbBispyribac sodium @ 20 g a.i. ha^-1 + Pyrazosulfuron @ 20 g a.i. ha^-1 POE). T₁₀ (Hand weeding) treatment though significantly reduced weeds dry weight and improved the grain yield and gave less benefit: cost ratio owing to higher cost of farm labour.

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