Coconuts Need Salt: Fertilize Them With Salt or Seawater!
Have you ever noticed that coconut trees very close to the ocean tend to have lots of large nuts!!?? It's because they need lots of chlorine (part of NaCl -- SALT!)
But most of the salt in the world has dissolved into water and gone to the ocean! So if you plant coconuts inland, you will experience drastic yield increases by fertilizing with salt! (Buy some salt or if you have a truck and a barrel, bring some salt water and dump it near the trees - then wash your truck!)
"From 1991 to 1997 farmers in the Philippines had fertilized more than 170,000 ha of coconut (approximately 18 M trees) with salt. This had resulted in an average relative yield increase of 125% over unfertilized coconuts."
Download the full pdf of the brochure made by the Philippine Coconut Authority: using salt as coconut fertilizer.