There are two different types of pans. A tillage pan and a fragipan. In your case, at this depth, I'd suspect a tillage pan caused by working the soil too wet at the depth of where the machinery ran. Normal freeze thaw should break up a tillage pan, but..... Subsoiling is an option. Make sure to pull at least 3 shanks, anyless actually creates more compaction than it helps. Ideally, rip, leave the cuts open all winter to the let water in and freezing break it up. I'm ripping some this fall, same situation. Using a 450C JD crawler and 3 shanks running 12 inches.
A fragipan is a different type of condition. Its caused by a mixture of sand and clay which forms a particular particle structure. Makes a layer almost like concrete and almost impossible to correct perminantly. I broke up a few 20 years ago with 3 shanks on a D7. Usually find these down about 18 inches. These want to reform, tillage pans dont. Esp if you can rip and then notill. Only way I know to keep a fragipan open is to inject organic matter into the cuts.
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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