The effect of two soil incorporated herbicides viz., trifluralin @ 0.90,1.20,1.50 kg a.i. ha -1 and acetochlor @ 0.094, 0.124 and 0.312 kg a.i. ha -1 on weeds and yield of canola was evaluated in a field trial at Agronomic Research Area, University of Agriculture, Faisalabad. Trifluralin @ 1.50 kg a.i. ha -1 was very effective in controlling the weeds and reducing their fresh and dry weight. Application of trifluralin @ 1.5 kg a.i. ha -1 reduced the weed density (7.00m -2 ) significantly as compared to control (32.67m -2 ) reducing the weed dry weight from 8.1 gm -2 to 1.7 gm -2 . Trifluralin @ 1.5 kg a.i. ha -1 showed maximum increase (34%) in canola seed yield by increasing the number of pods per plant, seeds per pod and 1000-seed weight.