RE: Moldboard vs. Middle Buster?
how tall/thick is the grass on the ground you are trying to disk? i use a 5' disk with a 35 horse tractor. if i'm going over established grasses, it takes several passes to make an appreciable amount of difference. and that is with the toplink tightened up (only the front disks will cut in).
to me, a rototiller is just a more expensive piece of equipment that can break. and more expensive to repair.