Symptoms
Plant shows stunted, erect growth. Seen from a distance, younger leaves are coloured uniformly pale, but when you look at them closely, it's rather an interveinal chlorosis.
The yellowgreen leaves show a narrow redbrown seam along the leaf margin and the leaf base has got a tint of the same colour.
Reasons
Sulphur deficiency
Nitrogen deficiency can cause similar chlorosis but begins at the older leaves.