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John: I'll just give you my limited experience, and you can draw your own conclusions. I have two areas that stayed overly wet in spring and early summer. One is my 75x150 garden, the other a 200x500 bottom-land pasture. After living with them for a couple years, I subsoiled what I thought of as 'drainage paths' in both. Went back-and-forth, cutting the soil as deep as I could--probably 22" or so (Ford 8N and single-shank subsoiler). In the garden, I spaced the rows about a tractor-width apart. In the field, I did a fan-shape from the up-hill end coming to a point at a drainage culvert...so perhaps spaced 30 feet at the uphill end and all coming together at the culvert. The last 2 seasons, both areas have drained well--been ready to plant weeks ahead of what they had been in the past. On the other hand, we have been having reduced rainfall here for the same time, so I am not totally sure it was the subsoiling or the lack of rain but it does seem to be much better when we do get rains. good luck,
Tom
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