Used as a catalyst in chemical synthesis, particularly in oxidation reactions. Employed in dry cell batteries due to its electrochemical properties. Serves as a precursor for other manganese compounds in industrial processes. Applied in agriculture as a micronutrient in fertilizers to correct manganese deficiency in soils. Utilized in biological research as a source of manganese ions in enzyme studies and cell culture. Also found in some dietary supplements and animal feed to support metabolic functions.