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Nitrogen Cycle

Nitrogen is essential for life and is constantly being recycled by living things. Learn about the cycle of nitrogen in our ecosystems.

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Nitrogen Cycle

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The process in which nitrogen, in the form of ammonium ions, is released during decomposition of plants and other organisms.


Process of converting nitrates in soil back into nitrogen gas; part of the nitrogen cycle.


Process of converting ammonium ions to nitrites or nitrates; part of the nitrogen cycle.

nitrogen cycle

Interconnected pathways through which nitrogen is recycled through the biotic and abiotic components of the biosphere.

nitrogen fixation

Process of changing nitrogen gas to nitrates; carried out by nitrogen-fixing bacteria in the soil or in the roots of legumes.

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