Effect of Herbicides Alone and in Combination on Direct Seeded Rice

Progressive increase in doses of both pendimethalin (from 1.0 to 2.0 kg ha⁻¹) and anilofos (from 0.4 to 0.8 kg ha⁻¹) resulted in decreased density and dry weight of all the weeds at 60 days stage. However, both the herbicides were more effective when 2, 4-D at 0.5 kg ha⁻¹ or bentazon at 0.72 kg ha⁻¹ were applied as follow up application. With follow up treatment pendimethalin at 1.0 kg ha⁻¹ with 2, 4-D at 0.5 kg ha⁻¹ recorded highest grain yield and weed control efficiency. Among alone applications oxyfluorfen at 0.25 kg ha⁻¹ was most effective as it was able to control both broad-leaved weeds and grasses, however, it was not as effective as herbicide combinations in obtaining grain yield.