Hi there.
Could anyone please give me some advice on the yellowing between veins on
the leaves of my Lemon tree.

The tree is about two years old and has flowered well again this year with
medium sized Lemons which are still green.
It is fed with a citrus liquid fertilizer on a fortnightly basis but still
exhibits this yellowing in the leaves, mostly between the veins. Any ideas
anybody what this apparent deficiency could be?
Many thanks. Len.