The decomposers help in decomposing the dead bodies of plants and animals, and hence act as cleansing agents of environment. The decomposers also help in putting back the various elements of which the dead plants and animals are made, back into the soil, air and water fore re-use by the producers like crop-plants .This maintains the fartility of soil and the soil would continue to support crops again and again. For example, the decomposers like puterfying bacteria and fungi decompose the dead plants and animal bodies into ammonia (and other simpler substances). This ammonia is converted into nitrates by the nitrifying bacteria present in soil. These nitrates act as fertilizer in the soil and are absorbed by the plants for their growth.
