Question: query regarding not getting the fruits in the arecanut plants. 
Answer: please use recommended doses of fertilizer- urea 220 gram, super 250 gram , potash 230 gram and borax 50 gram per plant in two equal split dose. once in the month of september/october and once in the month of march/april  in ring method 15-20 cm depth and 1 meter away from the plants.