When in doubt, a good choice is to select a balanced product, one with an equal percentage of all primary nutrients, such as 10-10-10. Another environmentally friendly fertilizing option is a slow release natural product, like Milorganite, which releases nutrients slowly to the plant (8-10 weeks) and adds organic matter to feed the soil.
A mature Orange tree needs 450 to 680 grams of nitrogen every year. Therefore, apply nitrogen fertilizer at 450 grams per annum of tree age. Apply slowly released nitrogen fertilizer solution, such as ammonium nitrate, ammonium sulfate, or urea, thrice a year. Once in early spring, early summer, and early fall.
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