* part of the M.Sc,(Ag.) thesis submitted to Tamil Nadu Agricl. University, Coimbatote.
Annual grass Echinochloa crusgalli (L.) Beaur was the major weed and competed with the rice. Weeds reduced the grain yield of rice 89% in both kharif and winter seasons. Heibicide mixtures of butachlor, fluchloralis, oxadiazon and thiobencarb with 2, 4-D EE was effective than individual application of the above herbicides- Pre emergence application of thiobencarb + 2,4-DEE (1.0 + 0.5 kg/ha) gave higher rice grain yield of 5483 and 4828 kg/ha in kharif and winter seasons respectively.
