why is earthworm called a farmer's friend?
Earthworms are known as friends of farmers since they further turn and loosen the soil .Like microbes,they also add humus to it by decomposing the dead plants and animals in the soil.Humus is a storehouse of essential plant nutrients .It provides high water absorption and water holding capacity through the soil by increasing air spaces.On turning the humus rich soil comes up.The manure gets mixed properly with the soil when it is turned and loosened.