A nitrogen compound metabolic process that contributes to the nitrogen cycle. The nitrogen cycle is a series of metabolic pathways by which nitrogen is converted between various forms and redox states; it encompasses pathways in which nitrogen is acted upon directly, such as nitrification, denitrification, nitrogen fixation, and mineralization. [GOC:mah, PMID:16675690, Wikipedia:Nitrogen_cycle]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process
