needrain said: Nitrogen hasn't corrected it.
On the first picture the older leaves are darker than the younger, it would be the opposite in nitrogen deficiency because nitrogen is mobile in the plant, so it moves it from the older leaves to the youngest in a deficiency situation, leaving the older ones paler. Nitrogen deficiency is usually all over the leaves rather than interveinal also. I don't think it is a macronutrient deficiency. Since your other one has the paleness the other way around, though, it's a bit of a puzzle. It'll be interesting to see what the iron does.
