Question: asking about how and what amount of fertilizer should be use in arecanut. 
Answer: --please use the recommended doses of fertilizer in two equal split doses- urea 100 gram, super 120 gram and potash 110 gram and borax 50 gram in ring method 1 meter away from the plant and 10-15 cm depth. fertilizers should be mixed together and apply once in the month of november and next dose should be apply in the month of march/april. you can also apply dry masturd cake or neem cake along with the fertilizer.