Spindifferent:
I am sure you can use the four place with any tractor, but several conditions will dictate just how much work you can get done, and how hard it will be on your tractor.
...We had a very dry fall here. I waited into late October hoping rain would 'soften' things up. We finally got an inch or so and I went to work. I had about twelve acres to renovate the second year and ten acres that hadn't been renovated before.
My old 57 hp(52pto) tractor seemed to work well on the previously renovated pasture, with the lone exception of a pipeline crossing. When the pipeline was put in, it was apparently capped with clay to protect the site, and was still very hard from a lack of rain. The tractor was stopped dead in its tracks numerous times while crossing that pipeline. ...There just wasn't enough power and traction to pull the renovator through that hard clay. I would have to back up, raise the renovator about half of the depth, and pull it on through. I was able to cut it, but a tractor much smaller would have not had a chance at all.
..The ten acres that had never been renovated went well, but the renovator rode fairly high most of the time. ...Definitely a lesson in the differences soil and conditions can make on tractor demand. ...If you have dry tight clay, you are going to need a lot of horsepower to run a four place renovator, while tight sandy loam will likely be done with a much smaller tractor. ...I think it is safe to assume that tractor demand from the renovator diminishes significantly in successive years. ....And you can always pick the renovator up and cut only as deep as the tractor is capable of for the first year or so. ..I have done that to some extent, and am seeing significant improvements in tractor demand.
This past year has been an absolute failure in my pastures, but I am still encouraged that things are looking much better. It is a rarity in this area to have extreme drought in the Spring, only to be followed by more drought in late summer and early Fall. ...I have again done the renovating, spraying, and clover seeding; waiting on a new year, with new expectations.