The truth is probably closer to say the plow will cut a width that depends as much on the soil as the plow and the plow share. For sure having a wider share is no problem because after the first furrow the extra just sits in the previous furrow. If the soil is friable vertically but sticks together side to side (like a thin sod) the moldboard will roll over a wider strip than the share cut.
There probably is an optimum width for a particular moldboard and share and soil.
When plowing alfalfa I sure wanted a share that was at least full width to reliably cut off the roots and so kill the alfalfa. A narrow cut share could leave a strip uncut and that's hard on the following corn crop because the alfalfa keeps the corn from sprouting.
The landside to share right corner measurement then sets a maximum cutting width for me, but it doesn't necessarily match the maker's designation for plow width.
Some AC plows (the ones I have a plow bottoms book for) use the same moldboard and share for a couple different widths, that has to confuse figuring out what the plow width if there's not a second beam to measure. Then if the plow can be mounted the plow width has to be (if its set right) the distance perpendicular from the landside to the inside face of the tractor rear tire or the inside face of the furrow wheel if a pulled plow. And that distance is often adjustable to add confusion.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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