Doug, Horsepower is horsepower. HP = torque x rpm. The reason tractors have high torque for a given horsepower is that they produce their rated horsepower at low rpm. Once it gets to the rear wheels, the engine torque is irrelevant because gear reduction has made the torque at the axle identical for the high rpm/low torque engine as for the low rpm/high torque engine.
The big reason your farm tractor will out-pull a garden tractor is weight. Garden tractors are never rated at the drawbar because they can't get much power to the drawbar. A 20 hp garden tractor would be lucky to get 10 hp to the drawbar. Another thing is that tractor engines tend to have a nice, flat torque curve so you don't have to downshift when the going gets tough and the engine lugs down. But as long as you can keep a fast engine running at rated rpm it can do just as much work as a slower engine.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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