Answer in Brief
Name any two bacterial biofertilizers.
Bacterial biofertilizers are :
- Rhizobia are rod-shaped, motile, aerobic, gram-negative, non-spore-forming, nitrogen-fixing bacteria containing Nod genes and Nif genes.
- They form symbiotic associations with the roots of leguminous plants.
- They bring about nodule formation on the roots and multiply inside the nodule.
- They fix atmospheric nitrogen into organic forms, which can be used by plants as nutrients.
- For e.g. R. leguminosarum is specific to pea and R. phaseoli to beans.
- It is the important and well-known free-living, nitrogen-fixing, aerobic, non-photosynthetic, non-nodule forming bacterium, intimately associated with roots of grasses and certain plants.
- It is used as a bio-fertilizer for all non-leguminous plants especially rice, cotton, vegetables, etc.
- It is a free-living, aerobic nitrogen-fixing bacterium associated with roots of corn, wheat, and jowar.
- It fixes the considerable quantity of nitrogen (20-40kg N/ha) in non–leguminous plants such as cereals, millets, cotton, oilseed, etc.
Concept: Microbes as Biofertilizers
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