A water fern, which is used as a green manure | vedclass

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(D) Azolla is a small aquatic fern that is cultivated in rice fields because it provides both green manure and fixed nitrogen to the crop.It contains

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Azolla

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(D) Azolla is a small aquatic fern that is cultivated in rice fields because it provides both green manure and fixed nitrogen to the crop.It contains a symbiotic cyanobacterium, $Anabaena \ azollae$, in its leaves which fixes atmospheric nitrogen.The use of Azolla in rice fields at the rate of $200 \ g$ per square metre can increase rice yield by $12.38 \ \%$.Experiments have revealed that the application of $10$ tonnes of fresh Azolla biomass per hectare adds approximately $100 \ kg$ of nitrogen to the soil.

$A$ water fern, which is used as a green manure in rice fields is

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