A field experiment was conducted at Navsari on heavy black soil at the experimental farm, N.M. College of Agriculture, Navsari Agricultural University, Navsari during summer seasons of 2011-12 and 2012-13 to find out the effect of 3 dates of sowing (16th February, 2nd march and 17th March) and 6 weed control strategies (Weedy check, weed free up to harvest, Pendimethalin @ 1 kg ha-1 (PE), Pendimethalin @ 1 kg ha-1 (PE) + Quizalofop-p-ethyl @ 0.05 kg ha-1 (POE) at 20 DAS, Quizalofop-p-ethyl @ 0.05 kg ha-1 (POE) at 20 DAS and hand weeding at 20 and 40 DAS) on weed flora and productivity of blackgram (vigna mungo L.). The pre-dominant weed flora were Echinochloa crusgalli L., and Cynodon dactylon L. among monocot; Cyperus rotundus L. among sedges; and Amaranthus viridis L., Digera arvensis L., Portulaca oleracea L., Alternanthera sessili L., and Euphorbia hirta L. among dicot. Significantly lowest weed population and dry weight of weeds was recorded when crop sown on 16th February. Significantly higher grain (1027 kg/ha) and stover (2249 kg/ha) yield with net returns of ` 15,163/ha and benefit cost ratio of 1.89 was produced with crop sowing on 2nd March. The lowest dry weight of weeds 228.72 kg/ha and weed control efficiency at harvest (78.53 %), were recorded in two hand weeding at 20 and 40 DAS. Nutritent content i.e N, P2O5 and K2O did not exert their significant effect in seed and stover of blackgram but uptake of N, P2O5 and K2O were found significantly higher when crop sown sown on 1st week of March (D2) closely followed by 3rd week of February (D1). The highest uptake of nutrients (N, P2O5 and K2O) by blackgram was observed under weed free up to harvest (W1), while weedy check plots recorded the lowest value. Highest seed (1131 kg/ha) and stover (2606 kg/ha) yield was recorded in weed free up to harvest and remained at par with two hand weeding at 20 and 40 DAS. The highest net realization of ` 19,120 with BCR of 2.28 was obtained from treatment of two hand weedings at 20 and 40 DAS followed by weed free up to harvest with net realization of ` 18,126 and benefit cost ratio (2.04).