It makes up chlorophyll, which is essential for plant life. In addition, it also has another role which is to be an enzyme cofactor.
Magnesium (Mg) participates in a number of vital plant processes that require and provide energy, such as photosynthesis, respiration, synthesis of molecules, carbohydrates, lipids, proteins and ionic absorption.
Deficiency – Appears on old leaves in the form of punctures, starting at the tips and along the margins. Red, rust-like necrotic lesions appear. The inner part of the stem bark is brownish in color.