This investigation was conducted on 20 year old mango trees ( Mangifera Indica L. ) cultivar Alphonso. Panicles were sprayed two weeks after fruit set with putrescine at 150, 300 or 450 ppm, KNo₃ at 0.5, 1 or 2% or CPPU at 5, 10 or 15 ppm. Results indicated that  both putrescine and KNo₃ significantly increased number of fruits per panicle. There was a direct relationship between the concentration and the number of retained fruits. putrescine recorded the lowest rate of fruit drop followed by KNo₃ and CPPU. Putrescine treatments significantly increased percentage of fruit retention at harvest. CPPU treatments increased firmness, weight, length, diameter and width of the fruit. Putrescine and KNO₃ increased TSS%. However, there was a negative association between the concentration of CPPU and TSS%. Fruit  acidity increased with CPPU and putrescine application. However, it decreased with KNO₃. TSS/ Acid ratio increased with putrescine and KNO₃. The highest value of vitamin C was recorded with 2% KNO₃ and the lowest one occurred with CPPU at 15 ppm.