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Boron (B)
Boron is presumed to play an important role in cell elongation, nucleic acid
synthesis, hormone response and the functions of the cellular membrane.
Its deiciency causes black necrosis on young leaves, and terminal buds.
Necrosis of young leaves begins with the basal end of leaves. Stems become
abnormally stiff and crumbly. Many branches may shoot out sideways but
the end of the stem is easily necrotized because cell division is inhibited.
Destruction of internal tissues of fruit and roots causes necrosis and defor-
mity.