The common nitrogen-fixer in paddy fields is

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(B) $Azospirillum$ is a nitrogen-fixing bacterium that forms a loose association with the roots of various plants,including paddy ($Oryza$ $sativa$).I

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Azospirillum

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(B) $Azospirillum$ is a nitrogen-fixing bacterium that forms a loose association with the roots of various plants,including paddy ($Oryza$ $sativa$).It is commonly used as a biofertilizer in paddy fields.Inoculation of paddy fields with $Azospirillum$ helps in increasing the crop yield and reduces the requirement for chemical nitrogen fertilizers.

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