Question: asking about how to improve the growth of coconut plant and management of leaf rot disease. 
Answer: treatment : for growth improvement  apply urea 300 gram, phosphorus 500 gram, potash 500gram  and borax 25 gram per plant in ring method. the ring should be 1.5 miter away from the plant. mix the fertilizer and apply in the ring and cover with dry leaves or soil.

for management of leaf rot:  apply hexaconazole 10ml per liter of water and pour in the ring before application of fertilizer and leave it for 2 days and than apply the recommended doses of fertilizer.