Bio-efficacy of Herbicide Combination on Weed Control and Yield Performance of Transplanted Rice (Oryza sativa. L)

A field experiment was conducted during kharif season of 2008 and 2009 at Agricultural Research Station, Ummedganj, Kota (Rajasthan) to study the efficacy of herbicide combination on weed control and yield performance of transplanted rice. Application of Glyphosate @ 0.75 kg a.i. ha⁻¹ at 15 days before crop establishment + Bensulfuron -methyl + pretilachlor (6.6GR) @ 0.06 + 0.60 kg a.i.ha⁻¹ at 8–15 DAT was found most effective in lowering the weed density of grassy and non-grassy weeds and their dry weight, and thus enhancing yield attributes and yield (6.06 and 5.76 t ha⁻¹) of rice, respectively in both the years. Among the weed control treatments maximum weed control efficiency (83.83 and 82.37%) and higher herbicide efficiency index (2.82 and 2.39) was under this treatment compared with the other sequential application of herbicides. On other hand weed control efficiency of different herbicide combinations were like wise, Glyphosate@0.75kg a.i. ha⁻¹ at 15 days before crop establishment + Butachlor@1.5 kg a.i. ha⁻¹ at 0–5 DAT (69.07 and 80.60%) and Butachlor@1.5 kg a.i. ha⁻¹ at 0–5 DAT (70.14 and 72.02%), followed by alone applications of Glyphosate@0.75kg a.i. ha⁻¹ at 15 days before crop establishment (64.21 and 69.17)