Centre county Pennsylvania, USA | Ted, I'll dig out earlier year yield files to find example for here. Haven't had time to download combine card this year we are still harvesting. Finally finished 2006 bean harvest tonight after dark. Attached picture was taken in sunlight today, it gives visual illustration of typical crop field topography here, 20% slopes are common. I believe folks in Palouse(sp) wheat country have some better examples.
Mark, you are probably correct for most corn belt farms, but gov't regulated farming is bigger than corn belt in US
 (FS beans Nov 26 2006, WM1.3.JPG)
Attachments
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 FS beans Nov 26 2006, WM1.3.JPG (36KB - 239 downloads)
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Productivity Map on Ripper = Soil Density Map?
