The common nitrogen-fixer in paddy field is _______________.

Azospirillum

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Oscillatoria

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Frankia

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Rhizobium

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Solution

The correct option is A Azospirillum
The common Nitrogen fixer in the paddy field is Azospirillum. This is a soil and root bacteria. It is a nitrogen-fixing bacteria when added to the soil it multiplies and supplies 30-40Kg nitrogen per hectare per season. It also produces Indole acetic acid which helps in growth.

Hence the correct option is A.

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