An agronomic investigation was carried out at Post Graduate Institutional Research Farm, Mahatama Phule Krishi Vidyapeeth, Rahuri, Dist. Ahmednagar, Maharashtra (India) during summer 2018 to study optimum irrigation schedule and the effect of foliar application of potash on growth, yield and quality of summer greengram. The experiment was laid out in split plot design with three replications. The experiment consists of twelve treatments involving four main plot treatments i.e. irrigation schedules at 40, 60, 80 and at 100 mm CPE and the subplot treatments are foliar application of 1 % potash (KNO3) at flowering, at pod development stage and at flowering and pod development stage. The experimental results revealed that, the maximum consumptive use of water recorded under scheduling of irrigation at 40 mm CPE (305 mm), followed by treatment irrigation at 60 mm CPE (223 mm). Among the different treatments, irrigation at 40 mm CPE recorded significantly higher seed yield (13.31 q ha-1) and yield attributes of summer greengram and it was at par with treatment irrigation at 60 mm CPE (13.08 q ha-1). Foliar application of 1% potash (KNO3) at flowering and at pod development stage recorded significantly higher seed yield (12.42 q ha-1) and yield attributes of summer greengram. The study showed results the irrigation at 60 mm CPE and foliar application of 1% potash at flowering and pod development stage to summer greengram found suitable preposition to achieve highest grain yield.