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(A) Blue-green algae (Cyanobacteria) such as $Anabaena$,$Nostoc$,and $Oscillatoria$ are autotrophic microbes that are widely used in paddy fields as b

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Nitrogenous

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(A) Blue-green algae (Cyanobacteria) such as $Anabaena$,$Nostoc$,and $Oscillatoria$ are autotrophic microbes that are widely used in paddy fields as biofertilizers. They possess specialized cells called heterocysts which are capable of fixing atmospheric nitrogen into organic forms like ammonia,which the plants can easily absorb. Therefore,they primarily increase the nitrogen content of the soil,thereby enhancing soil fertility.

Blue-green algae increase the concentration of which substances in the soil?

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