What are the characteristics of earthworm habitat?

Earthworm populations depend on both physical and chemical properties of the soil, such as soil temperature, moisture, pH, salts, aeration and texture, as well as available food, and the ability of the species to reproduce and disperse. One of the most important environmental factors is ph, but earthworms vary in their preferences. Most earthworms favour neutral to slightly acidic soil. Another important factor in the amount of moisture in the soil as the earthworm requires this to breath.