A field experiment was conducted during the kharif season of 2013 and 2014 at ICAR-Indian Agricultural Research Institute, New Delhi for assessing the influence of three different dates of sowing (D1 = Last week of June, D2 = First week of July, D3 = After first fortnight of July), two water regimes (rainfed and supplemental irrigation), and three varieties (Pusa Vishal, Pusa 9531 and Pusa 0672) on the total dry matter accumulation, leaf area index and yield and yield components in the greengram crop. The different dates of sowing affected different parameters and the crop sown in the first week of July had superior biomass accumulation as well as yield. Water regime did not affect the growth and yield as rainfall received at vegetative and flowering phase could suffice for the whole growth period of crop. Among the varieties, Pusa 9531 had higher biomass accumulation and yield as well as shelling percentage. Treatments having higher biomass accumulation also had higher leaf area index. Sowing dates as well as water regime did not influence the protein content in the grain while among the varieties Pusa 9531 had the highest protein content. It can be concluded that sowing the mungbean variety Pusa 9531 in the first week of July can give higher yield in North-West India.