Question

which bacteria decompose nitrogen compounds to liberate nitrogen in the air.​

Answer 1

Nitrogen -fixation...

These bacteria live in swellings in the plant roots called nodules . Nitrogen-fixing bacteria convert nitrogen gas from air into a form that plants can use to make proteins. ... When they die the nitrogen they have fixed into their biomass is converted into ammonium .

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Answer 2

Explanation:

the chemolithotrophic bacteria that reduce the nitrogenous compounds into atmospheric nitrogen are termed as denitrifying bacteria.