Question: asking about the fertilizer dose of arecanut tree. 
(more than 5 years old)
Answer: advised him to apply fertlizers like urea 225 gm, ssp 250 gm, mop 270 gm, borax 50 gm alongwith compost or cowdung 
10-15 kg per plant. divide the whole amount into two parts  and apply during march/april and october/november in ring method.