Activation of the nitrogenaze enzyme. It acts on the metabolism of nucleic acids. It has catalytic and structural functions and participates in the formation of chlorophyll.
Deficiency – It starts in the new leaves, in the highest parts. It is also common to notice that only the veins of the leaves remain green, while the blades turn yellow. In severe cases of iron deficiency, necrosis and leaf fall occur, leading to total defoliation.