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Cyanobacteria, or blue-green algae, is a bio-fertilizer, a type of organic fertilizer which contains living organisms and harnesses naturally occurring inputs like solar energy, nitrogen, and water to ensure soil fertility and plant growth. 

Small-scale farmers using bio-fertilizers have the potential to provide larger and more sustainable yields and healthier soils for themselves and their communities.

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Cynobacteria or blue-green algae is rich in nitrogen which helps the plants to grow fastly .. So It is used as biofertilizers.
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