| Front | N2 cycle |
|---|---|
| Back | - N2 in atm fixed by living organisms or non-living processes, if by living organisms, its either by mutualistic N2-fixing bacteria in root nodules or by free-living N2-fixing bacteria in soil to form NH3, if by non-living processes, its by either lightning or haber process into NH3 - NH3 nitrified into nitrites, which is nitrified into nitrates, which are either taken up by plants or released back into atm as N2, if released into atm, its denitrified - if taken up by plants, these are passed onto animals, and then ammonification occurs to release NH3 |
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