Thanks for your interest. There is a lot of variation but in general the topsoil (A horizon) is from 6 inches to several feet. This would be tops of hills to bottom ground.just been looking at your photos, thankyou for a great insight into your farming. looks to be great soil, how deep is it?
I am in the Clarion-Nicollet-Webster association. This is the DesMoines lobe of the Wisconsin glaciation. Our soils are around 10,000 years old. Part of the prairie pothole region.