By nitrogen fixation nitrogen gets fixed due to lightning.

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Lightning has a tremendous energy in it.
The nitrogen molecules breaks into smaller atoms and combine with air especially O
₂ (oxygen) to form respective oxides mainly nitrogen oxide.
Rain dissolves these molecules, thus bringing them on earth.
And this is how nitrogen gets fixed in the soil due to lightning.
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rhizobium and acetobacteria seen in plants like pea etc can increase nitrogen level of soil
Yeah correct :)