PJ welcome to YT! You may have been led to mistakenly call it a disk plow due to the 3 round disks you see in front of each moldboard which are often called bottoms for short. The proper name of the disks are ..rolling coulters.. Their main function is to cut vegetation and other matter on top of the soil so that it separates cleanly. Then the moldboard flips it over and whatever was on top of the soil is now buried in the bottom of the furrow the previous share and moldboard has cut. Longer vegetation such as a corn stalk if not cut tends to get stuck on the beam that supports the bottom and multiple one build up there you eventually can get a plugged bottom. The rolling coulter was designed to help minimize this problem. The link shows an early blade or knife type coulter.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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