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Fertilizing Citrus Trees

Since citrus trees are heavy nitrogen feeders, make sure your fertilizer contains more nitrogen (N) than phosphorous (P) and potassium (K). Use at least a 2-1-1 (N:P:K) ratio. Miracid Soil Acidifier is a water soluble product that works well and has a 3-1-1 ratio. In some regions, you may be able to find fertilizers that are formulated specifically for citrus and avocados. Buy a good brand and apply according to package directions. Many all-purpose products will work, as long as nitrogen is the highest element in the ratio.

Trace minerals such as iron, zinc, and manganese are also important, so make sure those are included in your fertility program. Foliar applications of trace minerals may be derived from kelp or other soluble fertilizers, and can be especially effective when applied to leaves that are about half of mature size.

Follow rates on the package carefully as fertilizers come in different strengths, release rates, and application schedules. Yellowing leaves indicate a 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, which can burn roots, even to the point of killing immature trees.

Quality Organic fertilizers are available in granular form, which can simply be applied to the soil surface. Because organic fertilizers are not as concentrated as commercial citrus fertilizers, you will need to apply more often. Soil-applied Organic fertilizers can be supplemented with foliar applications of fish emulsion or fish emulsion plus kelp to keep foliage green and trees healthy. More tips for fertilizing Organic Citrus can be found here: