Azolla is cultivated in rice fields as it provides both green compost and fixed nitrogen to the crop. The use of Azolla in rice fields at the rate of $200\, gm$ per square metre area can increase rice yield by $12.38 \,\%$. Eexperiments have revealed that application of $10$ tonnes of fresh Azolla biomass in one hectare, adds as much as $100\, kg$ nitrogen.