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Which of the following is/are used as biofertilizers?1. Azolla2. Blue-green algae3. Alfalfa Choose the correct answer by the given codes.

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Which of the following is/are used as biofertilizers?<br />1. Azolla<br />2. Blue-green algae<br />3. Alfalfa Choose the correct answer by the given codes.






 
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