Which one is a biofertilizer

NPK mixture

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Rhizobia in legume roots

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Rhizobia in farmyard manure

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Green manure

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Solution

The correct option is B Rhizobia in legume roots
All cyanophyceae member's are biofertilizers because they has fixing of NZ e.g. Nostoc. Rebulla, Rhizobia etc.

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