nitrify

verbs

convert into nitric acid, nitrous acid, or nitrate, especially with the action of nitrobacteria
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entails
add oxygen to or combine with oxygen
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change the nature, purpose, or function of something
"convert lead into gold"; "convert hotels into jails"; "convert slaves to laborers"
treat with nitrogen or a nitrogen compound
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treat (soil) with nitrates
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antonym
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provide with fertilizers or add nutrients to
"We should fertilize soil if we want to grow healthy plants"