What are biofertilizers ? name the categories organisms used as biifertilizers. how do their function help in organic farming ?

A biofertiliser is a substance consisting of microorganisms used to apply on seeds to enhance the availabilty of the nutrients to the plants.
Some groups of biofertilisers are:
1. Azolla- anaebana
​2. Rhizobium
​ Biofertilisers make the soil fertile and are cost effective. They help in organic farming as they are a natural way of enhancing plant nutrition. They does not cause pollution like the chemical fertilsers.

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