Micronutrients are also required by the microbes on a small level which are known as microelements or micronutrients or traces elements. These nutrients include manganese, zinc, cobalt, molybdenum, nickel, and copper. These are not essential elements for the growth of the microbes but these are involved in biological functions in several ways. For example, zinc (Zn2+) is present at the active site of several enzymes, manganese (Mn2+) involved in catalysis of the transfer of phosphate group, Mo (Mo2+) is essential for nitrogen fixation, etc.
