2010 · Q24
Which among the following statements about bio fertilizers are correct ?
- 1Azotobacter is one of the Nitrogen fixing bacteria used as a bio fertilizer.
- 2They have’ to be applied to the leaves of the plant only.
- 3They alter the chemical composition of the soil.
- 4They can be used along with organic fertilizers.
General KnowledgeAgriculture
- A1 and 4 only
- B1,2 and 4 only
- C2 and 3 only
- DI, 2, 3 and 4
Explanation
Azotobacter fixes nitrogen (1) and biofertilizers suit organic systems (4); they are not leaf-only nor soil-chemistry changers.