Ammonification is the process by which
ammonia is released during the decomposition of nitrogen-containing organic compounds
ammonium is converted to nitrite and nitrate in soils
nitrate from soil is transformed to gaseous nitrogen compounds such as no, n2o, and n2
gaseous nitrogen is fixed to yield ammonia

Ammonification is the process by which ammonia is released during the decomposition of nitrogen-containing organic compounds.

Explanation:

Ammonification is the conversion to ammonium ion of nitrogen, in living matter it appears mainly as amino (-NH2) or imino (-NH-) groups. Animals, which do not oxidize nitrogen, get rid of what they have in excess in the form of different compounds. Aquatics directly produce ammonia (NH3), which in solution is converted to ammonium ion. Terrestrials produce urea, which is very soluble and easily concentrates in the urine; or insoluble nitrogen compounds such as guanine and uric acid, which are purines, and this is the common form in birds or insects and, in general, in animals that do not have a guaranteed supply of water.

Biological nitrogen that no longer reaches the substrate as ammonium, mostly in continental ecosystems, is converted to that form by the action of decomposing microorganisms. The nitrogen ammonium ion is considered an essential part of this process.