Nitrogen Cycle

Nitrification
When Ammonium ions are oxydize, to form nitrite and then nitrite is oxydized in order to form nitrate. It is catalysed by different species of bacteria
Putrefaction
The process of decay of dead remains.
Why nitrate compounds are important?
Becuase they need nitrate compunds in order to convert glucose in proteins or amino acids.
Denitrification
When you convert the nitrate back to gaseous nitrogen.