- to oxidize (ammonia, ammonium compounds, or free atmospheric nitrogen) to nitrites and then to nitrates, especially in soil by bacterial or other microbial action.
- to infuse with nitrogen or nitrogen compounds.
- to treat or combine with nitrogen or its compounds.
- (formerly) to convert into niter.
- to treat or cause to react with nitrogen or a nitrogen compound
- to treat (soil) with nitrates
- (of nitrobacteria) to convert (ammonium compounds) into nitrates by oxidation
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