The common biofertiliser used in organic farming is:
Nitrogen fixing bacteria and cyanobacteria
A biofertiliser is a substance which contains living microorganisms which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. The common biofertiliser used in organic farming are cyanobacteria and nitrogen-fixing rhizobium.