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Re: Rock/Stone
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Posted by 720Deere on December 29, 2003 at 06:47:04 from (151.196.178.52):
In Reply to: Rock/Stone posted by JCB on December 28, 2003 at 17:07:26:
I believe it is a combination of most all the things mentioned below. The ground freezes around the rock which is a semi-solid object. As the ground freezes, it expands forcing the the solid object to move upward away from the more compacted subsoil. During the many freeze and thaw cycles, the rock moves a little each time and rain forces soil under the rock. Then we come along with our plows and discs and turn the soil and rocks over and voila we are picking rocks again! If you don't believe that the freeze cycle has anything to do with it, just visit a tennis court that had the fence posts concreted at the surface. I have replaced many tennis courts in Maryland and tried several methods, but a concrete fence post foundation that does not go below the frost line will heave every time. We have even tried to mushroom the bottom of the hole to prevent this lifting effect then pave over the concrete and seal around the posts. In a few years of serious frost, you still get posts that heave. It's just an opinion and I'm sure someone in Florida will say that they don't have frost but still have rock problems. I'm not saying that it is the only or even primary cause, but I believe it certainly facilitates the rock migration. How else would a field that has been plowed only 6-8" deep for over 100 years continue to "grow" rocks? You should eventually be able to totally eradicate the rocks from that top 8" of soil. Bottom line is if you don't want rocks, don't turn the soil.
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