The best fertilizer for paddy is

  • A

    Azolla pinnata

  • B

    Bacillus megatherium

  • C

    Rhizobium meliloti

  • D

    Bacillus polymyxa

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Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium

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Azolla is used as a biofertilizer because it

Definitions / Explanation : Mycorrhiza

Organic forming does not include