It is one of the constituents of chlorophyll, its presence is essential for photosynthesis.
Deficiency – Initially the older leaves show yellowing and interveinal chlorosis. Next, parts of the margins of the necrotic leaves appear. Necrotic areas may also occur between the main and secondary vein.
Deficiency symptoms are very clear and initially occur on the older leaves at the base of the branches, characterized by yellowing of the interveinal regions of the leaves, whose V-shaped spots evolve from the leaf margins towards the central vein.