Which of the following is used as green manure?

Azadirachta

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Hevea

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Crotalaria

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Azolla

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Solution

The correct option is D Azolla

Azolla is one of the most important ferns in agriculture.

It helps in nitrogen fixation along with cyanobacteria/blue-green algae and hence helps in improving soil fertility.

Hence, they are used as a green manure usually in paddy fields.

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