What is the difference between topsoil and fill?

Answer 1

Fill is not optimized for growing grass, plants, shrubs or trees. It is often sandy or contains high clay content because it is taken from deeper under the surface, where little organic material exists. Topsoil, on the other hand, is optimized for use as a nutrient-rich top layer ideal for growing grass and plants. It often has compost mixed into it, and its composition is more balanced than that of fill. There is more organic material in it, and it should not appear sandy or clay-ey. Bottom line is, you use fill build up low areas and level the field, and then cover it with a few inches of topsoil so you can grow stuff and prevent erosion.

Answer 2

Topsoil is the uppermost layer of soil that is rich in nutrients and organic matter, making it ideal for plant growth. Fill soil, on the other hand, is commonly used to fill in depressions or create mounds and may contain a mixture of soil, sand, gravel, or other materials. Fill soil is typically not as nutrient-rich as topsoil and may require additional amendments for successful plant growth.