Field experiment were carried out during Zaid season of 2021 to find out the effect of planting geometry and phosphorus on economics and qualities in summer moong crop. An experiment was conducted at Agronomy Research Farm, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya (U.P.). The experiment was laid out in Factorial Randomized Block design with three replications. The total treatment combinations were twelve and keeping three planting geometry viz., 30 cm x 10 cm, 30 cm x 15 cm and 30 cm x 20 cm and four phosphorus levels viz., 0, 20, 40 and 60 kg/ha. Results revealed that there was significant variation among different treatments in respect of economics, the planting geometry of 30 cm x 15 cm were proved significantly superior in terms of seed yield, as well as gross return, net return, and B:C ratio compared to other rest treatments of summer moong crop. Quality aspect as only protein yield was significantly increased at 30 cm × 20 cm planting geometry over rest of planting geometry. The percentage increment of its geometry over narrow planting geometry (30 cm × 10 cm and 30 cm × 15 cm) were 4.66 and 1.77%, in respect of protein yield, respectively. The highest grain yield of summer moong, economics viz., gross income, net income and benefit cost ratio were significantly more received upto 40 kg ha. P2O5 over 0 and 20 kg/ha. phosphorus levels, respectively. The percentage increment of 40 kg P2O5/ha. over no phosphorus and 20 kg P2O5/ha. were 37.16 & 20.72%, 35.05 & 19.86%, 49.76 & 27.55% and 38.71 & 23.45% in respect of grain yield, gross income, net return and B:C ratio, respectively. The protein content in grain and straw significantly improved upto 40 kg/ha phosphorus per ha. in summer moong. The significant response was observed upto 60 kg/ha. phosphorus application in protein yield only. The application of 40 kg P2O5/ha. enhanced the protein content in grain, protein content in straw and protein yield by a margin of 14.50, 4.80 and 12.09% over no phosphorus, respectively.