Question

a bacterium that can take atmosphere nitrogen and cover it into a soluble form

Answer 1

Hey.....

A bacterium called Rhizobium converts atmospheric nitrogen into the soluble form, which can then be taken in by plants. Rhizobium bacteria present in roots nodules of leguminous plants like pea, beans fix.......

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Answer 2

Answer is Rhizobium Bacteria.
Rhizobium bacteria present in the root nodules of leguminous plants like peas , beans fixes atmospheric nitrogen  and increases the soil fertility.
They are called as Biological nitrogen fixers.
Rhizobium bacteria have symbiotic relation ship with leguminous plants .