Conversion of atmospheric nitrogen into inorganic form by living organisms or physical factors

Process of utilizing absorbed nitrogen for synthetic purposes

Process of conversion of nitrogenous wastes into inorganic nitrogenous compounds (ammonia)

Conversion of ammonia by nitrifying bacteria into nitrites and nitrates

Conversion of part of ammonia into nitrogen gas by certain bacteria which goes back into the atmosphere

Nitrogen fixation

Assimilation

Ammonification

Nitrification

Denitrification