To increase the production of soybean crops,$..........$ is used as a biofertilizer.

  • A
    Azospirillum
  • B
    Rhizobium
  • C
    Nostoc
  • D
    Azotobacter

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The biofertilizer present in the roots of legumes is

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Which of the following is not a major source of biofertilizers?

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