Two comments: One time when my tractor trouble shooting was comming back from the state contest there was an Amish farmer plowing. The boys wanted to talk to him. This is early spring and he said by the time he did his everyday chores his goal was to plow at least one acre per day. Now this is for Chris. Brady's over in Paulding county Ohio which has some very heavy soil farmed 5000 acres all with horses. As you may know they were there own Oliver dealer and had Soth Bend built Row Crop #6. He said  at one time they farmed with 12 standard Row Crop Tractors. They would hire all the kids in town and work 2 shifts. First shift was daylight till noon. Second shift was noon to dark. I should have kept some notes. The had one old rowcrop there at that time yet and most of the lugs were so thin they had holes worn in the lucgs.