Topsoil in Illinois
How thick was prairie topsoil when it was first plowed? How
thick is the topsoil in the midwest now?
According to a Illinois Agricultural publication I read some years ago,
in Illinois, 1830's the topsoil was about 24 inches deep. In 1983 the
average was 6 inches in depth. Ask your own state's Department of Agriculture
for their information.
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Update: June 2012