Prokaryotes and the Nitrogen Cycle
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Prokaryotes drive nearly every step of the nitrogen cycle: fixation converts atmospheric nitrogen to ammonia, nitrification oxidizes it, denitrification returns it to air.
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In agricultural soil, nitrifying bacteria convert crop-applied ammonia fertilizer to nitrate, the form most crop roots take up most readily.
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Eukaryotes cannot fix atmospheric nitrogen — every step of biological nitrogen fixation on Earth depends on prokaryotes.