Abstract

Field experiments were conducted during rabi season and summer season at experimental farm of the Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore). The treatments included were five doses of new formulation of pretilachlor (0.5,0.75,1.0,1.5, 3.0 kg ha-1), butachlor 1.25 kg ha-1, anilofos 0.4 kg ha-1 and rifit 0.75 kg ha-1 (M/s. Gharda chemical formulation) compared with hand weeding twice and unweeded control. The experiments were laid out in a randomised block design with three replications. The predominant weeds of the experimental fields were Echinochloa crus-galli, Leptchloa chinensis among monocots and Marsilea quadrifoliata among dicots. The results of the experiments revealed that, pre emergence application of pretilachlor 1.0 kg ha-1 and pretilachlor 0.75 kg ha-1 with a hand weeding at 45 DAT offered better weed control and resulted in increased yield and economics of transplanted rice, compared to the recommended weed control methods of butachlor 1.25 kg ha-1, anilofos 0.4 kg ha-1 and rifit 0.75 kg ha-1 and hand weeding twice

Keywords: Pretilachlor, weed control, yield, rice