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Is there something in the soil profile that causes a problem when the roots get down a certain depth eg a thick layer of limestone which they don't like.My brother told me about an orchard of avocado (or citrus ?) where dozens of trees started dying back after they got to about 8-10 years old. IIRC it was when their roots started to hit a layer of impenetrable limestone under the top layer of red sandy soil.
Is there something in the soil profile that causes a problem when the roots get down a certain depth eg a thick layer of limestone which they don't like.
My brother told me about an orchard of avocado (or citrus ?) where dozens of trees started dying back after they got to about 8-10 years old. IIRC it was when their roots started to hit a layer of impenetrable limestone under the top layer of red sandy soil.
