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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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