What are biofertilisers? Give two examples.
Biofertilisers are used to provide additional supplement for increasing the nutrient content in the soil which helps in the overall development and growth of the plants.
For example rhizobium is used as a nitrogen fixing bacteria to fix atmospheric bacteria in the soil. Another example of biofertiliser is Nostoc a blue-green algae which increases the soil fertility and adds organic matter to the soil.
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