A field experiment was conducted during Kharif 2005 & 2006 at Zonal Research Station, Chianki, Palamau (Jharkhand), to evaluate the efficacy of herbicides/sequential application of herbicides in transplanted rice (Oryza sativa L.). The major weeds floras were Echinochloa colonum (L.), Echinochloa crusgalli (L.), Cyperus rotundus (L.) & Cyperus difJormis (L.). Pre-emergence application of almix at 3 DAT (0.025kg/ha) fb sequential application of 2,4-DEE at 20 DAT (0.5 kg/ha) was most effective in minimizing weed population & their dry matter accumulation and increasing weed control efficiency & grain yield next to two hand-weedings. Both were at per. 80.1% & 77.7% increase in grain yield was recorded in two hand-weedings & almix fb 2,4-DEE (0.025 fb 0.5 kg/ha), respectively over weedy check. Almix fb 2, 4-DEE (0.025 fb 0.5 kg/ha) recorded highest net returns (Rs. 18070/ha) and benefit:cost ratio (1.99). Two hand weedings although significantly reduced weed density & their biomass and increased the grain yield, owing to higher labour cost reduced the benefit: cost ratio.
Transplanted rice, Weeds, Herbicides, Yield attributes, Yield, Economics
