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Q.
The main sources of biofertilizers are
AMUAMU 2010Microbes in Human Welfare
Solution:
Biofertilizers are defined as biologically active products or microbial inoculants of bacteria, algae and fungi (separately or in combination), which may help biological nitrogen fixation for the benefit of plants. Biofertilizers also include organic fertilizers (manure, etc), which are rendered in an available form due to the interaction of microorganisms or due to their association with plants.