Carbon metabolism, can activate many kinds of enzymes, play the role of activator. Magnesium is indispensable in maintaining the structure of ribose and nuclear proteins and determining the physicochemical properties of protoplasm. It also has an indirect effect on respiration.
Generally in acidic sandy soils, highly leached and low cation substitution, the parent material of low magnesium content of calcareous soils, or acidic soils too much lime or potash fertilizer, the soil is often easy to lack of magnesium. Young trees lack of magnesium, easy to cause early defoliation, mostly occurring in midsummer. Sometimes overnight leaves basically fall net, adult trees lack of magnesium, more from the base of the new leaves, light green loss between the veins, heavy fruit can not be normal maturity, the fruit is small, poor coloring, no flavor.
Magnesium is too much, it will cause an imbalance between the elements in the tree, such as causing insufficient calcium absorption, potassium deficiency, and zinc deficiency.