Ammonia fixation

... how Rhizobium makes interaction with plants and how it converts N2 as Ammonia. My doubt is How it is done? Rhizobium is a soil bacteria and it ... under the soil. . Then, How atmospheric nitrogen is absorbed for N2 fixation ? Plz clear my doubts.

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I think that while ammonia->nitrite is part of the nitrogen cycle, it's not considered part of fixation.

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... , condensation.... Nitrogen Cycle lightning/nitrogen fixation bacteria(n2)-->ammonia--->nitrification(N03)--->absorption(nuclei acids, proteins)-->ammonification(ammonia, ...

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