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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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