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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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