questions: query regarding flower dropping in papaya. 
 answers:  please spray any one of the following vitamins- planofix 1ml/4liter of water or mohaphol/sagorika 2ml/liter of water throughly in the flowering region. 3 times once in a week
you are already apply dap, so now you have to apply potash 80 gram and compost 7-10 kg per plant in a ring method 30-45 cm away from the plant.  

every 3 months interval you have to apply thr following recommended doses of fertilizer-urea 100 gram, supar 300 gram and potash 80 gram in ring method per plant.