Question: query regarding how to control the fruit drop of mosambi. 
Answer: apply mixture of micro nutrient 6 mlor gram per liter of water near the root zone and also spray by covering the whole plant 4 times once in a week. at the time of flowering spray planofix 1 ml/4.5 liter of water at 15 days interval in the evening time in the absence of rain. you can also apply urea 50 gram, ssp 80 gram and mop 25 gram per plant in ring method 45 cm away from the plants