Abstract

                                A field experiment was conducted at Wetland farms of Tamil Nadu Agricultural University, Coimbatore to evaluate the different weed management practices on growth and productivity of rice variety CO 51 during late Samba, 2017-18. The experiment consisted of eight treatments viz., Unweeded check (T1); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by hand weeding at 20 DAT (T2); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Metsulfuron methyl + Chlorimuron ethyl @ 4 g a.i. ha-1 (POE) at 20 DAT (T3), Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20 DAT (T4); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20 and 35 DAT (T5); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20, 30 and 40 DAT (T6); Power weeder at 20 and 35 DAT (T7); Power weeder at 20, 30 and 40 DAT (T8). The experiment was conducted in RCBD and replicated thrice. The results revealed that the application of Pretilachlor combined with either hand weeding on 20 DAT (T2) or with power weeding twice (T5) or thrice (T6) or with chemical combinations had registered more LAI, drymatter production, number of tillers m-2, resulted more productive tillers m-2, filled grains panicles-1, panicle length which ultimately resulted in higher grain and straw yields.

Key words : Growth parameters, Machine transplanted rice, Weed management, Yield.