A field experiment was conducted to investigated the effect of foliar application of boron and GA₃ on the physico-chemical composition, yield and cost benefit ratio of phalsa. The trial was undertaken at the Horticulture Garden of Department of Horticulture, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur during 2015-16 and 2016-17. There were 4 levels each of boron and GA₃ i.e. 0, 30, 40, 50 ppm and 0, 10, 20, 30 ppm, respectively tried in a Factorial Randomized Block Design replicating thrice. First foliar application of the respective treatments was given when the flower buds were fully swollen and it was super imposed after three weeks. Observations were recorded on juice content, T.S.S., ascorbic acid, acidity and yield. Boron and GA₃ in increasing concentration increased all the attributes profoundly barring acidity content. Foliar application of boron at 50 ppm improved the above attributes significantly expressing 50.59, 49.87% juice, 19.58, 19.770 Brix T.S.S., 30.95, 31.33 mg/100g ascorbic acid and 56.72, 59.88q/ha fruit yield against the minimum of 44.89, 44.92%; 17.89, 18.06°Brix; 27.21, 27.53mg/100g and 46.76, 49.17 q/ha registered under control (B₀). GA₃ treatments also proved profoundly effective in increasing the above parameters and application of 30 ppm recorded 51.25, 51.28% juice, 19.94, 20.13° Brix T.S.S., 30.42, 30.81 mg/100g ascorbic acid and 59.88, 63.27 q/ha fruit yield against 44.78, 44.06%; 17.70, 17.87° Brix; 28.06, 28.38mg/100g and 39.35, 41.21 q/ha values, respectively under control. 50 ppm Boron or 30 ppm GA₃ produced less acidic fruits recording 1.450, 1.540% and 1.375, 1.440% acidity content against phalsa bushes deprived of foliar sprays of boron or GA₃ (producing most acidic fruits) revealing 1.662, 1.160% and 1.830, 1.860% during corresponding years. It is obviously observed that cost benefit ratio increased progressively in increasing levels of boron and GA₃. The cost benefit ratio was calculated on average data of 2015-16 and 2016-17. In this regard the maximum levels of boron (50 ppm), GA₃ (30 ppm) and their interaction (B₃G₃) recorded 2.13, 2.34 and 2.63 cost benefit ratio and their control exhibited 1.68, 1.38 and 1.21 ratio, respectively.