UF recommends the following,
https://edis.ifas.ufl.edu/publication/HS1389"a split fertilization plan with 3 applications is recommended, with 50% applied in late dormancy (March) and 25% each in June and September. A balanced fertilizer including macro- and micronutrients is suggested. The amount used in year 10 can be applied in succeeding years. Magnesium deficiencies can occur if soil potassium or calcium levels are too high, and manganese and iron can be scarce in soils with a pH above 7. Heavy applications of quick-release nitrogen should be avoided because this can increase fruit drop."
The nursery where I got mine recommended organic fertilizer (they use composted turkey manure & worm castings) 3 times a year by spreading evenly below the tree canopy.
First application: January/February when trees are still dormant at rate of 1 lb per tree for young trees and 3 lb for trees 3 years and older
Second application: June at ½ lb per tree for young trees and 1.5 lb for trees 3 years and older
Third application: September at same rate as 2nd application