I think it might in fact be iron deficiency. Can you take a closer up image of the leaves so that we can see the chlorosis between the leaves?
Iron deficency is not generally a lack of iron in the soil but rather an inability to get it into the leaves, which often happens after cold spells
"Classic iron deficiency symptoms are a pronounced interveinal chlorosis ( see Figure ). From a distance, iron deficiency, at first, may be perceived to be a nitrogen deficiency. However, with iron deficiency young leaves and leaflets are affected first, which is the opposite of typical nitrogen deficiency. Although leaf veins normally remain conspicuously green, leaf veins may also become chlorotic with iron deficiency."
http://extension.uga.edu/publications...
Provide more images and please look to see if the older leaves are worse than the newer leaves
This will help us distinguish between nitrogen, zinc and iron
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