How does $Azolla$ (a pteridophyte) increase rice production?

  • A
    $Rhizobium$
  • B
    $Nostoc$
  • C
    $Anabaena$
  • D
    $Frankia$

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Which of the following pairs represents biofertilizers?

The nitrogen-fixing microorganism associated with $Azolla$ in rice fields is .......

Which bacteria act as biofertilizers in paddy fields?

Farmers have reported $50\%$ higher yield of rice by using which biofertilizer?

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

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