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(D) Paddy fields (rice cultivation) require significant amounts of nitrogen for optimal growth. Cyanobacteria,such as $Anabaena$ and $Nostoc$,are comm

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Symbiotic or non-symbiotic cyanobacteria

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(D) Paddy fields (rice cultivation) require significant amounts of nitrogen for optimal growth. Cyanobacteria,such as $Anabaena$ and $Nostoc$,are commonly found in paddy fields. These organisms can fix atmospheric nitrogen,either symbiotically (e.g.,$Anabaena$ $azollae$ in $Azolla$ ferns) or non-symbiotically (free-living),thereby enriching the soil with nitrogen and acting as an excellent biofertilizer for rice crops.

Which of the following is the most suitable fertilizer for paddy fields?

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