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Among the various types of plows in use today are the reversible two-way plow for contour plowing; listers and middlebusters, which prepare shallow beds; the disk plow , whose revolving concave disks are useful in working hard or dry soil; the rotary plow, with an assembly of knives on the shaft that mix the surface growth with the soil; and the chisel plow, with points mounted on long shanks to loosen hard, dry soils and shatter subsurface hardpan.
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