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No as in no fertilizer? Palm/cactus mix from the big box store doesn’t have much in the way of nutrients.
I know, there are people that say no fertilizer (and even no watering!) for mangoes, including experts. That is sort of correct in my view. For juvenile mango trees that have are not large enough to bear fruit, I want to encourage quick vegetative growth to get them large enough to fruit. So I do give fertilizer with nitrogen, along with grass clippings and wood chip mulch. Something like 8-3-9 with micronutrients should do the trick for your young tree, even the standard fruit tree fertilizer from Home Depot works well enough if you want an easy option. Your local nursery should have the specialist fertilizers like slow-release Nutricote or Osmocote. The 6 month slow-release is a good choice if you can find it. Water heavily for fast growth as well.
Once your 3 foot mango tree gets to 6 feet tall with a thicker trunk, then you can adjust your routine to the fruit production stage, to limit the nitrogen and limit the water during bloom/fruit time.