Yup, most of western Kansas is farmed with them.
We call them undercutters, with a little more modern term sweep plow. They are a V shaped blade of 5' or 6' in total width, with several coupled side by side on a flexing frame. Most farmers will have a 20' 25'or a 35'wide model. They typically have "pickers" behind them. The path of the blades overlap slightly, with the adjoining sweeps offset fore and aft to accomodate the overlap. The pickers look similar to a single row of rotary hoe teeth. They kind of kick the weed loose from the dirt, making for a better kill rate. They are usually pulled at 5 to 7 mph. The idea is to not turn the soil over, thereby conserving moisture. A much needed measure where the rainfall is only 19 inches annually. Chemicals have taken over to a certain extent, and they conserve enough extra moisture that crops can be grown that otherwise would not have enough moisture to produce a crop. I had a 1070 Case, which is about 108 HP. Pulling a model that had two 5' blades and two 5.5' blades, I could work 160 acres per day. While I loved pulling a 15' one-way plow, an undercutter was much more efficient to conserve moisture and for covering acreage.
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