Azolla can be used as a biofertilizer as cyanobacteria. Cyanobacteria live in symbiotic association with the roots. As a result, Azolla-Anabaena can fix almost three times more atmospheric nitrogen than legumes. Typical rates for legumes are 400 kg of nitrogen per hectare per year those for Azolla-Anabaena are 1100 kg of nitrogen per hectare per year.
So, the correct answer is option C.
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