Table 1 . Deficiency symptoms in sunflower. The first symptom is usually deformation of the younger leaves, then disintegration of terminal growing areas. Symptoms appear almost immediately and there is very little growth. The yellowing or chlorosis of the younger leaves is most obvious in the intervenal areas and appears in a very short time.
Veins remain green longer than the intervenal areas.
The cotyledons and lower leaves very rapidly turn yellow to brown and die. There is very little growth. In some species like corn, a red or purpling occurs along the veins. The plants show little growth, have slender stems and have dark green leaves. In some plants like corn, production of anthocyanins may cause red or purple color.