A field experiment with ten treatments in randomized block design was conducted at Pantnagar in the year 2005-06 and 2006-07 to evaluate effect of Sesbania brown manuring on rice weeds and its yield. Rice shoot dry weight was related to weed dry weight at 28 days of crop stage. There was not significant difference in all those treatment where pendimethalin was applied with respect to weed dry weight and rice shoot weight. Row seeding resulted in lesser weed dry weight and higher rice shoot dry weight, however, treatment difference was insignificant. Weed dry weight continued to increase up to 84 days stage and then it declined at harvest in the weedy plot. At 56 DAS and subsequent stages dry weight was less in all those treatments where hand weeding was done at 30 DAS than those treatments where it was not done.