denitrify
verb [ T ] chemistry specialized uk/diˈnaɪ.trɪ.faɪ/ us/diˈnaɪ.trə.faɪ/
使脱氮，去氮
to break up nitrates (= chemicals containing nitrogen and oxygen), for example in soil, and so release nitrogen into the air
Denitrifying bacteria reduce the fertility of the soil. 脱氮菌会降低土壤的肥力。