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Related Terms:
animal
oxide
atmospheric
faeces
systemic circulation
assimilated
plant
anammox
decompose
rain
circulation
carbon cycle
soil
elemental
nitrobacterium
natural
bacteria
deposited
lightning
pulmonary circulation
nitrogen
Definitions:
Noun
nitrogen cycle
Definition: the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil
Definition: The natural circulation of nitrogen, in which atmospheric nitrogen is converted to nitrogen oxides by lightning and deposited in the soil by rain, where it is assimilated by plants and either eaten by animals (and returned as faeces) or decomposed back to elemental nitrogen by bacteria.