Fertilizing Citrus Trees
Since citrus trees are heavy nitrogen feeders, make sure your fertilizer contains more nitrogen (N) than phosphorous (P) or potassium (K). Use at least a 2-1-1 ratio. Miracid Soil Acidifier is a water soluble product that works well and is a 3-1-1 ratio. In some regions, you may be able to find specialized citrus/avocado fertilizers. Buy a good brand and apply according to package directions.
Also important are trace minerals like iron, zinc, and manganese, so make sure those are included as well. Many all-purpose products will work.
Follow rates on the package carefully as fertilizers come in different strengths, release rates, and application schedules. Foliar applications of trace minerals in the form of kelp or other soluble fertilizers are effective on leaves when half their mature size.
Yellowing leaves indicate lack of fertilizer or poor drainage. Dark green, lush leaves with burned tips indicate excessive fertilizing.
We prefer slow release fertilizers in the granular form rather than fertilizer stakes. Stakes can burn or even kill immature trees.