Once again, you guys came to the rescue. I've checked my catalogs and both Northern Tool and Tractor Supply offer sub soilers and middle busters. I'm guessing that a sub soiler is what I want. I can't see my little tractor pulling a 14 inch wide furrower through caliche; however, if I set the 3/4 inch wide sub soiler shank fairly shallow, I should be able to get through just about anything. I think I'll make myself a shovel like the one our carpenters used to clean out the trenches for footings. They took a standard (cheap) spade and cut off the sides until the spade was only about 4 inches wide. That made a spade that was perfect to reach into narrow spaces after the rebar was in place. I suspect a spade like this would be perfect to clean out a trench after I went over it a few times with the subsoiler. Thanks again for the information.