Field experiments carried out in rice–wheat cropping system revealed that 29 weeds infested the rice crop and out of them 10 and 2 weed species were absent on 30th day and maturity stages, respectively. Total weed intensity was 116 weeds/m2 at 15-30 day stage of rice, which was double (201 weeds/m2) at maturity stage. Direct seeded rice had significantly higher weed intensity (143 and 226 weeds/m2 at 30DAS and maturity stages, respectively) with the highest weed biomass of 5.55 q/ha at maturity stage than all other 3 tillage and sowing methods. Wheat crop was infested with 17 weed species out of which two species were absent at 30 DAS and maturity stages. The zero till wheat had significantly higher weed intensity (121 and 81 weeds/m2 at 30 DAS and maturity stages, respectively) than other three tillage and sowing methods. The former had also significantly higher weed biomass than latter. The weed intensity was higher (95 weeds/m2) at 30 DAS than that at maturity ( 59/m2).