SOUND WEED MANAGEMENT OPTIONS FOR SUSTAINABLE CROP PRODUCTION

An investigation was carried out to evaluate the performance of different weed management options regarding effective weed control, yield and yield contributing characters of three popular brri (bangladesh rice research institute) released aman varieties (brri dhan39, brri dhan49 and br11) having different growth duration in the year of 2008 and 2009 at bangladesh rice research institute, regional station, rajshahi. weed management options were pre (pretilachlor) and post emergence (pyrozosulfuran-ethyl) herbicide, brri weeder, hand weeding (three times), pre and post emergence herbicide along with one supplement hand weeding and control (no weeding). weed dry matter was significantly highest in control plot (78.67 g m^-2) followed by brri weeder (45.03 g m^-2) and lowest in hand weeding (20.17 g m^-2) and pyrozosulfuron-ethyl with one supplement hand weeding (22.2 g m^-2. weed population showed significant effect on panicles m^-2. highest panicle m^-2 was obtained in hand weeding treated plot and lowest in pyrozosulfuron-ethyl with one supplement hand weeding treated plot. among the varieties, br11 produced significantly higher yield (5.02 t ha^-1) while lowest yield was recorded in brri dhan39 (3.58 t ha^-1). irrespective of weed management options, hand weeding and post emergence herbicide with one supplement hand weeding produced significantly higher yield 4.89 and 4.80 t ha^-1, respectively while lowest yield was recorded in control plots (3.29 t ha^-1).