Alexi,
The mamey almost never gets watered or fertilized. It's a mature tree, and is partially shaded by a mahogany tree.
I do throw any fruit or vegetable scraps from the kitchen under the mamey tree, though. A friend told me I am "composting in place" but mainly the mamey is closest to my front door, so it gets the vegetable scraps.
In contrast, my Pantin mamey has never gotten past the stage of being very drought-sensitive. If I don't water it during hot weather it drops all its fruit; I haven't eaten a Pantin in all the many years I've had the tree....