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The common nitrogen-fixer in paddy fields is
Option: 1
Frankia
Option: 2
Rhizobium
Option: 3
Azospirillum
Option: 4
Oscillatoria
Answers (1)
Plants cannot use nitrogen from the atmosphere. There are nitrogen-fixing bacteria that convert atmospheric nitrogen into ammonium compounds and supply them to plants. Examples include Azotobacter, Frankia, Rhizobium, Azospirillum. It can be seen that Azospirillum is widely used in rice fields as a nitrogen fixing organism. It is used as bio-fertilizer in rice fields.It promotes plant growth.So the correct answer is "Azospirillum". Hence, option 3 is correct.
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