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Citrus Trees

Q.Citrus tree leaves turning yelloe

Zone Tucson, AZ. | Victoria Ruinard added on August 19, 2018 | Answered

The citrus trees in the community garden where I live had been neglected for years so I’ve been working on them for about a year. They are full of fruit for 2 months but alot of the fruit is small and doesn’t seem to be ripening. Also; the leaves are turning yellow. I’ve fertilized and used Epsom salt for a calcium deficiency but that didn’t seem to help. Any advice would be greatly appreciated. Thank you!

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Answered on August 20, 2018

Hi Victoria; The pattern of discoloration on the leaves in the photos are characteristic of a nutrient deficiency, but I recommend that you don't try to address it with guesswork and individual nutrient products. BTW epsome salts is Magnesium sulfate, magnesium and sulfur, not Calcium. Lime or gypsum supply Calcium.

For fertilization, it's better to use a complete, mineralized, slow release organic fertilizer.

Since arid zone soils tend to be alkaline, I would mulch with a material like this:
And then follow up with a fertilizer like this, or a citrus specific fertilizer:

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