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Nitrogen cycle
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Diagram illustrating the nitrogen cycle, showing how nitrogen moves between the atmosphere, biosphere, and soil through natural processes like nitrogen fixation, assimilation, ammonification, nitrification, and denitrification, as well as through human activities such as fertilizer use and industrial emissions. Blue arrows indicate natural activities, and red arrows indicate human activities.
The importance of nitrogen and phosphorus in ecosystems
Close-up of two green broad bean (Vicia faba) pods growing on a plant with broad leaves. Colorful diagram of the nitrogen cycle showing how nitrogen moves through the atmosphere, biosphere, and soil. It illustrates natural processes like nitrogen fixation, assimilation, ammonification, nitrification, and denitrification, as well as human activities such as fertilizer use and industrial emissions, with arrows and labels connecting elements like plants, animals, bacteria, and factories.
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Cross section of Earth showing the core, mantle, and crust
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Nitrogen cycle: Media

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The importance of nitrogen and phosphorus in ecosystems
An overview of the nitrogen and phosphorus cycles in the biosphere.
Video: Encyclopædia Britannica, Inc.

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nitrogen cycle
The nitrogen cycle.
Encyclopædia Britannica, Inc.
fava bean
Pods of the broad bean, or fava bean (Vicia faba). The symbioses of fava...
© Esin Deniz/stock.adobe.com
Nitrogen cycle
Diatomic nitrogen gas is transformed into ammonium, nitrate, and nitrite compounds...
Encyclopædia Britannica, Inc.
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