You say harrow plow, but in Minnesota, it’s a disk plow.
On page 24 of the July 2010 issue of Farm Collector is a photo of a harrow plow. In Minnesota, it was called a disk plow. They were used on farms that had gumbo soil. They made slat-bottom plows for that, but some of the soil was so sticky that it didn’t want to slide even on a slat-bottom plow. That is where a disk plow would work, because it turned as it went through the soil.
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