I am essential for oil seeds and pulses and can cause Akiochi disease in rice due to excess of Hydrgen Sulphide. Who am I?

Explanation: Manganese (Mn) is an important micronutrient for plant growth and development and sustains metabolic roles within different plant cell compartments. The metal is an essential cofactor for the oxygen-evolving complex (OEC) of the photosynthetic machinery, catalyzing the water-splitting reaction in photosystem II (PSII).