Which of the following is a biofertilizer reported to increase rice production by more than $50\%$?

  • A
    Mycorrhiza
  • B
    Azolla pinnata
  • C
    Cyanobacteria
  • D
    Legume-Rhizobium symbiosis

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Blue-green algae increase the concentration of which substances in the soil?

By what percentage does crop productivity increase with the use of biofertilizers?

Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer?

Which substance of biological origin is used to maintain and increase soil fertility?

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