Data collection
The efficacy of herbicides on different weeds was evaluated at 42 DAS and at crop maturity. For each sampling time, two quadrats of 40 cm × 40 cm were randomly located in each plot to determine the density and biomass of different weeds. Weed count was recorded by species, whereas biomass was recorded by weed category (as broadleaved, grasses, and sedges). Weed biomass was recorded after drying the weed samples at 70 °C in an oven for 48 h. The crop was harvested manually from the undisturbed net plot area on October 13, 2012 and October 23, 2013. The harvested area for grain yield was 12 m2 during both years. Grain yield was converted into t ha−1 and adjusted to 14% moisture content.