Manganese

A micronutrient, which is represented by the chemical symbol Mn. Manganese is involved with the formation of chlorophyll, the activation (i.e. being a cofactor) of many enzymes, and the process of photosynthesis. A deficiency can result in interveinal chlorosis (but this can also arise from manganese toxicity), possibly with misshapen leaves, reduced root and vegetative growth, and with uptake being significantly reduced in alkaline soils.

Manganese toxicity can result in plant death, or by interacting with other nutrients resulting in them to become deficient for healthy growth, including Calcium, Iron and Magnesium.