Manganese (Mg) deficiency and excess, how to identify symptoms and intervention methods

Lack of Manganese (Mn)

Manganese deficiency is rarely found and is usually accompanied by the deficiency of 2 other microelements, iron and zinc. Like many other deficiencies, this one also manifests itself on the leaves which maintain green veins and yellow the areas immediately around them, spreading to the old leaves. The progression of the deficiency can cause leaf necrosis and consequent falling, in general the behavior of the plant appears limp and dejected.

Yellowing of the area around the leaf veins

leaf necrosis

Floppy plant

Treatment: 

Supplement with microelements and Cal-Mag type products

Excess Manganese:

Slow growth and new leaves with rust color additional deficiencies of iron and zinc.