Discuss about the Biofertilizers.

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answered Jun 3, 2019 by Anik (71.5k points)
selected Jun 3, 2019 by Vikash Kumar

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Chemical fertilizers major pollutant.
Switch to organic farming and use of biofertilizers need of the time.
Main sources of biofertilizers. Bacteria, Fungi & Cyanobacteria. Eg Rhizobium present in roots of leguminious plants fix atmospheric nitrogen into usable organic form. Azospirillium and Azotobacter – free living bacteria – fix atmospheric Nitrogen.
Symbiotic Associations Eg.Genus Glomus sp. form mycorrhiza.
Fungal symbiont absorbs phosphorus from soil and passes it to plant.
Plants show resistance to root – borne pathogens.
Tolerance to salinity and drought.
Increase in growth and development.
Cynobacteria– autotrophic – fix atmospheric nitrogen Eg. e.g. Anabaena, Nostoc, Oscillatoria.
Blue green algae – increase fertility by adding organic matter