|Class 12 Biology Microbes In Human Welfare||Microbes as biofertilizers|
Biofertilizers are organisms that enrich the nutrient quality of the soil.
The main sources of biofertilizers are bacteria, fungi and cyanobacteria.
Some microbes used as biofertlizers are-
The fungal symbiont in these associations absorbs phosphorus from soil and passes to the plants.
Plants having symbiotic association show resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development.
Cyanobacteria are autotrophic microbes which can fix atmospheric nitrogen. Example - Anabaena, Nostoc, Oscillatoria
Blue green algae also add organic matter to the soil and increase its fertility