The present participle or gerund form of azotize, describing the act of introducing nitrogen into a chemical compound.
From 'azotize' + '-ing' (present participle marker). American spelling variant of 'azotising,' both from French 'azote' meaning nitrogen.
Nitrogen fixation—the azotizing of compounds—happens naturally in soil thanks to bacteria, which is why some farmers rotate crops to let nitrogen-fixing plants rebuild the soil.
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