A field experiment was conducted during kharif seasons of 2008 and 2009 at the research farm of Birsa Agricultural University, Ranchi with the objective to study the effect of establishment and weed control methods on weed dynamics and productivity of rice. Results indicated that transplanting of rice recorded reduced weed population as well as dry matter with higher weed control efficiency resulting in higher grain yield. Among weed control methods, application of pyrazosulfuron as pre emergence 20 g/ha + mechanical weeding (40 days after sowing) with lower weed population and weed dry matter had higher weed control efficiency as well as grain yield. Transplanting associated with application of pyrazosulfuron + mechanical weeding produced maximum and significantly higher grain yield (4244 kg/ha) of rice.