Pre-plant or pre-emergence application of trifluralin at 0.50 kg ha" supplemented with one hand hoeing at 30 days stage provided effective control of weeds and significantly increased seed yield of blackgram over weedy check, one hand hoeing or application of herbicides alone. Higher dose ofherbicides alone did not improve weed control or seed yield further compared to their lower dose. The highest net return and B : C ratio were registered with pre-emergence application of trifluralin at 0.50 kg ha-'+one HW followed by preplant application of trifluralin at 0.50 kg ha-'+one HW. Yield and profit with pendimethalin werc less due to lower yield and higher cost of herbicide.