HP to pull 36x20 Kinze?
Might trade from 32 row 15" Kinze to a 36 row 20" planter. Have been using Challenger 35 (175 hp) with 18" tracks with no problems and ~600 gallons of liquid on tractor. The 4 extra rows won't be as much as all the extra beam and frame weight. Mostly flat land, pretty heavy black soils. Will want liquid on the new one also.
Re: HP to pull 36x20 Kinze?
I think in your situation...It probably depends most on how fast you want to plant. If you're moving along at 6.5 mph...I would look for about 240 engine horsepower. If I was moving 4 mph...I think I could get by with 190. It doesn't sound like you've got many hills...