bkrgi
Bronze Member
I've owned and used both on garden plots, with two different 45hp tractors. My experience has been exactly as above. The disc is almost useless on sod or vegetated, undisturbed ground. You might get something OK after 6-10 passes, but will have spent a ton of time and probably compacted the soil below 4-6" in doing so. A good rototiller will break sod in one pass, and make a nice seedbed in two passes. The big discs used by professional farmers have four to eight times as much weight per disc wheel as anything readily available for small tractors, so they work much more effectively.
Soil type matters. A dry, sandy soil with thin vegetation will let a small disc work pretty well. Damp clay soil with healthy vegetation will keep it from penetrating.
Totally
Relative to soil types and vegetation mat, a disk is not going to work well. Plow then disc or tiller will cut through making a much better finish product.