Manganese is required by leaves and seeds. The most important role of Manganese (Mn) is the induction of photolysis of water molecule during the process of photosynthesis, during which oxygen is the byproduct of process.
This mineral is also essential for many activities especially associated with enzymes required for the processes like photosynthesis, respiration and nitrogen fixation.
It is absorbed in its ion form Mn++.
Manganese is an activator of enzymes like carboxylase, oxidase, dehydrogenase and kinase.
Deficiency symptoms are as follows:
Yellowing of the plant leaves (between the leaf veins of young leaves), browning of leaf edges; usually seen on the younger (upper) leaves
Grey spot disease in oat
Occurrence of Interveinal chlorosis
Formation of grey blots on the leaves
Poor development of root system; size of plant parts are reduced (like leaves, shoots, fruit)