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The Nitrogen Cycle

Nitrogen is essential for many biological processes but only certain forms of it can be used by different organisms. 78% of the atmosphere is made of nitrogen gas, but most living organisms cannot utilize nitrogen in this form.

Michelle Vanhala

on 29 August 2012

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Transcript of The Nitrogen Cycle

The Nitrogen Cycle Nitrogen (N2) in Atmosphere Nitrogen fixing bacteria
in root nodules
and soil bacteria
convert the N2 to Ammonium (NH4+) Nitrifying bacteria perform
nitrification. Nitrosomonas -
Ammonium (NH4+) becomes Nitrite (NO2-) Nitrobacter -
Nitrite (NO2-) becomes Nitrate (NO3-) Denitrifying bacteria convert
the nitrate back to nitrogen gas (N2) Nitrogen Fixation Nitrification Denitrification Nitrates are taken up and used by plants Plants and animals die and decay
and the nitrogen is returned to the
soil as Ammonium Ammonification Plants are eaten by animals Ammonium can be taken
up by plants.
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