The common nitrogen-fixer in paddy fields is (a) Rhizobium (b) Azospirillum
The common nitrogen-fixer in paddy fields is
(a) Rhizobium
(b) Azospirillum
(c) Oscillatoria
(d) Frankia
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Correct Option (b) Azospirillum
Explanation:
Azospirillum is a nitrogen fixing bacterium in paddy fields. It is very useful soil and root bacterium. It is an associative symbiotic N2 - fixing bacteria. When it is added to the soil, it multiplies in millions and can supply 20-40 kg of nitrogen per hectare per season.
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