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  4. Nitrogen fixing microbe associated with Azolla in rice fields is

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Q. Nitrogen fixing microbe associated with Azolla in rice fields is

AIPMTAIPMT 2012Microbes in Human Welfare

Solution:

Azolla plays a very important role in rice production. Azolla and its nitrogen-fixing partner, Anabaena, have been used as green manure to fertilize rice paddies and increase production. With the help of Azolla, rice can be grown year after year, several crops a year, with little or no decline in productivity; hence no rotation of crops is necessary.