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Nitrogen Cycle

Published on Nov 19, 2015

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Nitrogen Cycle

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Nitrogen makes up 78% of Earth's atmosphere. It's also in important things like chlorophyll, nucleic acids, and protein.

Photo by blmiers2
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Plants can't use atmospheric nitrogen because gaseous nitrogen is in the form of N2, which is held together by a very strong triple bond.

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Nitrogen gas must undergo nitrogen fixation to be converted into nitrates for plant use.

Photo by Vilseskogen
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Nitrogen-fixing bacteria convert nitrogen gas into nitrates. The bacteria live in soil and on the roots of legumes.

Photo by elyse patten
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Confused yet?

Photo by Nina Matthews Photography
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When organisms die, they decompose. Decomposers release nitrogen in the form of ammonium ions. This is ammonification.

Photo by ressaure
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Nitrifying bacteria convert the ammonium ions into nitrites and nitrates. This is called nitrification.

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Denitrifying bacteria convert some of the nitrates into nitrogen gas. This is denitrification. (opposite of nitrogen fixation)

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