A field experiment was conducted during 2010 and 2011, at Kalimpong with the objective of improving the production of rice with sustainable weed management practices. Study revealed that the two species of Echinochloa i.e E. colona, and E. crusgalli preferred moist condition and continued to grow under shallow submergence condition of hills. Among all the chemical treatments grassy weed biomass was lowest with the application of Pretilachlor fb by 2,4 DEE (1.0 and 0.5 Kg ha-1, respectively). This treatment was followed by incorporation of Pendimethalin fb 2,4 DEE (1.0 and 0.5 Kg ha^-1, respectively). Amongst various chemical treatments, minimum weed biomass was registered with the incorporation of Pretilachlor fb 2,4 DEE (1.0 and 0.50 Kg ha^-1, respectively) and was statistically superior to other set of experiment during the first year of at 30 DAT. However in the second year of 30 DAT this treatment was at par with the Pretilachlor (1.0 Kg ha^-1) and statistically better than other chemical treatment practices. Amongst various chemical treatments maximum grain yield of 5.13 t ha^-1 was observed in first year with the application of Pretilachlor fb 2,4 DEE (1 and 0.5 Kg ha^-1, respectively) and was at par with the Pretilachlor (1.0 Kg ha^-1) (5.7 t ha^-1) and hand weeding twice (5.23 t ha-1). However, in second year highest grain yield of 4.93 t ha^-1 was registered with the application of Pretilachlor fb 2,4 DEE (1 and 0.5 Kg ha^-1, respectively), and was at par with the Anilofos + 2,4 DEE (1 + 0.5 Kg ha^-1 ) (4.81 t ha^-1) and hand weeding twice (5.0 t ha^-1). Straw yield was maximum observed with the hand weeding twice (6.80 t and 6.46 t ha-1), and was at par with the Pretilachlor fb 2,4 DEE (1 and 0.5Kg ha-1, respectively) and Anilofos +2,4 –DEE (1 + 0.5 Kg ha^-1 ) during both the years this was at par with the Pendimethalin (1 Kg ha^-1), Pretilachlor fb 2,4 DEE (1 and 0.5Kg ha^-1, respectively) and Anilofos +2,4 DEE (1 + 0.5 Kg ha^-1).