I'm goning to side with you Gary. If you are plowing at constant depth all the way across a field, N to S and E to W, then 1 of 2 things is happening. You are a very wealthy man because you farm good, even, consistant, productive soil or you are not paying close enough attention to your implement. Draft control does raise the lift arms. What else could it or would it do? When you hit a tough patch of dirt, the plow pulls hard, right? I don't think anyone will argue this. When this happens and you have a green tractor, the tractor dies. If you have IH power, you spin your wheels. Well spinning your wheels doesn't get you anywhere, so the tractor lifts the front of the plow. How fast it lifts depends on how you have the draft set. Every action has an equal and opposite re-action. Sir Issac Newton told me this back in HS. Therefore, the force used to lift the plow is first transferred down on the tractor tires. Hopefully this extra little bit of force will give enough added traction to enable the tires to hold enough to pull through the tough spot. The tires can only be compressed so far, however. This depends on psi, tire size, etc. When no more force can be applied down on the tires, the plow will start to raise. Yes, you don't maintain consistent depth, but what else can you do? You have to keep moving. You can't hardly plow some of your field with a 5 bottom, then switch to a 4 to get through the tough spots. I think Hugh farms some pretty nice soil where he's at. I know around here its not uncommon for an 80 acre farm to have 4 different soil types. We have a yield moniter in our combine. We have spots where we can get 200 bpu corn, and other spots in the same field in the same year where we get 100. Same seed and chemical and fertilizer applied to the entire field. Its just that the soil is that much tougher. You won't get a bumper crop off of every acre.
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