My field has had some of the topsoils sold off of it decades ago by previous owner leaving behind mostly clay and I am in a wet area plus my field had decades worth or horse traffic compaction. Needless to say it did not drain the best.
A subsoiler will help your drainage problem - my field improves every year. I try to subsoil every fall but sometimes run out of time. I have been doing this for a few years now and can see and have personally experienced the benefits. By spring my field is smooth again.
Forget the coulter though as I do not think it is needed and would probably limit how deep you could go and simply be more trouble than benefit. Some of those older Dearborns subsoilers (Dearborn is Ford) had a really thin main shank (the thinnest I have personally seen or used). I used a borrowed Dearborn my first couple a years but hate to borrow things so eventually bought a cheap King Kutter subsoiler for myself when Quality went out of business at a nice price. The King Kutter main shank is slightly wider but I ground the leading edge to a v-point to help somewhat.
The Dearborn was slightly nicer than my King Kutter as it left a slightly thinner slit in ground but in reality I am getting nit-picky here. Long story short, I think you will be happy with the results from even the cheapest crudest subsoiler that you use. However if you want to get nit picky then look for an older Dearborn in good shape.
This post was edited by rankrank1 at 10:03:33 12/16/12.
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