by people of coastal districts. Seaweed-fertilizer also helps in breaking down clays. Fucus is used by Irish people as a biofertilizer on a large scale. In tropical countries, the bottom mud from dried-up ponds which contain abundant blue-green algae is regularly used as biofertilizer in fields.

Bacteria

Plant-Growth Promoting Microorganisms:
*Rhizobium: Symbiotic nitrogen fixation by Rhizobium

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