' Cynobacteria are used as biofertilizers in rice field 'Comment.
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The most efficient nitrogen-fixing cyanobacteria are Nostoc linkia, Anabaena variabilis, Aulosira fertilisima, Calothrix sp., Tolypothrix sp., and Scytonema sp. ... Azolla-Anabaena association is an example of symbiosis for nitrogen fixation and nutrient enrichment in the rice paddy field
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