Master gardners RECOMMEND using Lesco 8-2-12 ---it is a slow release fertilizer & pricy @ $50.00 per bag BUT is worth it.
NEVER use epsom salt.

You are absolutely correct. By the way, John Deere is now SiteOne. They are at the corner of Griffin Road and Thomas Avenue. I was just there earlier buying another bag of Lesco. In fact, the price has dropped $6.00 from two weeks ago.

The most important item that can when lacking will cause yellowing... is water.

2nd most important.. is pH. Average in TV is 7.2 and will cause a deficiency in nutrient uptake, even if you are fertilizing.. the palms cannot use the fertilizer if the pH is too far from the target for the species you have.