A field experiment was carried out to study the effect of doses and stages of application of tritluralin on soybean and associated weeds during kharif 1998 and 1999 at Pantnagar. Results revealed that weed control efficiency of trifluralin at 0.50, 0.75, 1.00, 1.25 and 1.50 kg ha" was higher when applied as pre-plant soil incorporation as compared to its corresponding doses of application as pre-emergence. Uncontrolled weeds, on an average, caused 88.6% reduction in the grain yield of soybean. All the treatments produced significantly more grain yield than weedy check. At all the rates, pre-plant soil incorporation produced significantly higher grain yield of soybean than that of pre-emergence application. Tritluralin at 1.25 and 1.50 kg ha-' as pre-emergence and 1.00 kg ha- I as pre-plant soil incorporation produced almost similar grain yield of soybean.