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प्रश्न
Ravi wanted to grow rice in his field. He was very concerned about environmental degradation, so he did not want to use chemical fertilisers. Suggest a suitable biological method to Ravi.
अति संक्षिप्त उत्तर
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उत्तर
He should use biofertilisers such as cyanobacteria (Anabaena, Nostoc, Aulosira), nitrogen-fixing bacteria like Azospirillum, or Azolla (a fern that harbours Anabaena) to enrich the soil without using chemical fertilisers.
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