Boron Deficiency in Neonotonia Wightii
In the early stages, leaves and shoots will be dark green. The leaves will be thick and narrow and may be malformed, with the two lateral leaflets being of unequal size and shape. When boron deficiency is severe, the shoot tip becomes necrotic and secondary growth is initiated. In older plants, a mild deficiency is manifested by yellow and orange tints in the upper leaves. Root growth is reduced, there is little branching, and the root tips will be brown and bulbous.