Middlesex,
United Kingdom 
The leaves on my orange tree are turning yellow/brown and falling off
25 May, 2010
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Previous question
The problem depends on what part of the leaf is turning yellow. If the parts in between the veins are turning yellow this suggests magnesium or iron deficiency in the plant. If older leaves are dying this suggest nitrogen deficiency. In any case, keep the fertiliser up to it.
31 May, 2010