Question

how do microorganisms increase the soil fertility

Answer 1

The soil is home to many animals. Microorganism like some algae , bacteria fungi are present in the soil. Bacteria and fungi present in the soil feed on dead remains of animals and plants and forms humas (which is rich in nutrients and makes the soil fertile). Thus in this way microorganisms make the soil fertile.



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Answer 2

microorganisms present in soil are capable of fixing nitrogen 'nitrogen fixation' on their own which help the plant to gain its nourishment