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The main farming operation draft control is used for is moldboard plowing. Postion control lowers the plow to a fixed, pre-set depth, and leaves it there. Draft control responds to the increased draft of the plow while going through a "tough spot", and raises the plow, putting increased downward pressure on the rear tires while raising the plow, which helps with traction if the tractor is beginning to "spin out", and the "draft" is now lessened, because the plow is not in the ground as deep. As the plow passes the "tough spot", and draft decreases, the draft control drops the plow back to the original depth. You don't mention a specific tractor... some have a 2-position lever, and you have to choose either "depth control" or "draft control". Some tractors have a lever that allows for infinite adjustment between full draft control and full position control, or a mix of the two. I hope this helps, a LITTLE!
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