yes, earthworms are called nature ploughman because the help farmers in many ways
Earthworm moves through the soil that loosens and aerates the soil. This also helps the water to reach the roots quickly.
Earthworm ‘s excreta increases the fertility of the soil and help the soil to absorb more water..
After their death, they get decomposed and add humus to the soil.
Also unlike pesticides or toxic substances, there is no harmfull effect on soil due to earthworms.
nearly it can consume all biodegradable materials and convert it into Rich Manure. Farmers use earthworms for making manure this process is called vermicomposting.
For these reasons, the earthworm is beneficial to garden soil, giving them the nickname "nature's ploughman."