6.3.3.3 Nitrogen Cycle

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Nitrogen fixation is...

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nitrogen gas to ammonia

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Denitrification is...

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nitrates to nitrogen gas

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Ammonification is...

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organic nitrogen compounds to ammonia

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Organic nitrogen compounds are:

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DNA, RNA, amino acids, proteins

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What do nitrifying bacteria do?

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ammonia → nitrites → nitrates

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These bacteria convert nitrates to nitrogen gas

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denitrifying

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These bacteria convert ammonia to nitrites

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Nitrosomonas

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These bacteria have a mutualistic relationship with leguminous plants.

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Rhizobium

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These bacteria oxidise ammonia to nitrites: Nitrobacter, Rhizobium, Azotobacter, Nitrosomonas

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Nitrosomonas

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These bacteria oxidise nitrites to nitrates: Nitrobacter, Rhizobium, Azotobacter, Nitrosomonas

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Nitrobacter