Ammonifying bacteria are bacteria which convert ammonia into atmospheric nitrogen. They can be symbiotic or non-symbiotic. Symbiotic ammonifying bacteria form root nodules and supply the ammonia or ammonium to the plant. Non-symbiotic bacteria that ammonify live openly & use ammonia for their own metabolism. Ammonifying bacteria, for example, include Bacillus vulgaris and Bacillus ramosus.