Answer: Citrus will actually grow in a fairly wide range of soil types and pH ranges. Since your tree is in a container, the most important thing is soil with excellent drainage. Citrus needs plenty of moisture, so use a soil with a high organic content, which holds moisture and promotes drainage.
Citrus requires nitrogen to thrive. Fertilizer applications are usually split into three equal portions throughout the year, rather than applying it all at once. You can also use a fertilizer formulated specifically for citrus.
Citrus sometimes suffer from iron chlorosis, in which the leaves turn yellow, but the veins remain green. If this happens, apply an iron chelate, which roots can readily absorb. Hope this info helps!
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