1) In many reclaimed areas that where jungle and such they need to mix the organic matter in the soil better to grow conventional crops.
2) In areas that are farmed hard and have deep top soil they turn the soil to being up fresh fertile soil so shallow root crops can grow better.
3) In some areas with heavy irrigation they get too much salt in the top layer of soil. They have to blend it in to keep growing crop there.
4) In areas like CA they do it to get the good topsoil turned up and sand turned under. Much of the San Joaquin valley has been deep tilled. It is a former sea floor and the topsoil is deep under sediment that is sandy.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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