Immobilization in soil science is the conversion of inorganic compounds to organic compounds by micro-organisms or plants, by which it is prevented from being accessible to plants. Immobilization is the opposite of mineralization where the inorganic nutrients are taken up by soil microbes making them unavailable for plant uptake. Immobilization process is a biological process controlled by bacteria that consume an inorganic nitrogen and form amino acids and biological macromolecules (organic forms). Immobilization and mineralization happen continuously and concurrently whereby nitrogen of the decomposing system is transformed steadily from inorganic to organic state by immobilization and back from organic to inorganic state by decay and mineralization.