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ni'trogen cy"cle




the continuous sequence of events by which atmospheric nitrogen and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants, the substances returning to the air and soil as a result of the decay of the plants and denitrification.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

nitrogen balancenitrogen dioxide
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