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The common nitrogen-fixer in paddy field...

The common nitrogen-fixer in paddy fields is

A

Rhizobium

B

Azospirillum

C

Oscillatoria

D

Frankia

Text Solution

Verified by Experts

The correct Answer is:
B
Azoespirilllum is a nitrogen fixing bacterium in paddy fields. It is very useful soil and root bacterium. It is associative symbiotic `N_(2)` fixing bacteria. When it is added to the soil, it multiplies in millions and can supply 20-40kg of nitrogen per hectare per season. It also producess growth promoting substanes like indole acetic acid (IAA), Gibberellins `(GA_(3))` and promotes root proliferation. these substances improve the plant growth and yield.
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