From what I have read over my recent times here, that might be ok for the first couple of years for the young trees. After that, however, those in the know that post here often say the established trees do better with a fertilizer that has no nitrogen. Other micronutrients are also beneficial throughout the years from what I am reading. If you are in Southeast FL, I suggest you check out themangoplace site as he has a specific blend for established mango trees.