The common nitrogen­fixer in paddy fields is

  • [AIPMT 2010]
  • A

    Rhizobium

  • B

    Azospirillum

  • C

    Oscillatoria

  • D

    Frankia.

Similar Questions

$VAM $ is important for

Some blue green algae can be used as biofertilizer as they are

Organic farming includes

$I.$ use of biofertilisers and biopesticides

$II.$ crop rotation

$III.$ locally developed pest resistant varieties

Choose the correct option

Aquatic fern which is an excellent biofertilizer

  • [AIPMT 2000]

The main sources of biofertilisers are