Curt, Growing up in Iowa, "the debt furrow" was just as fertile as the soil that was plowed. Some farmers were too lazy to close up the debt furrow and the crops grew just as well, and the field ended up very uneven. If leaving an open furrow caused the soil immediately under to be dead, then turning over any soil slightly too deep would have often disturbed the dead soil in any part of the field and would leave the dead soil in the planting zone. That would have been too great a gamble for farmers to take and they would have plowed very shallow...if at all. Iowa has a lot of black fertile soil that is deeper than plows ever turned over...and Iowa was where the term "debt" was used. LA in WI
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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