Sodbusting calls for a moldboard plow.
I have never seen a "tow behind" Chisel Plow, but presume it is a conservation type plow, like mounted Chisel Plows, designed to pull
through crop residue, not
turn sod.
There are rocks, then there are ROCKS. A moldboard plow can handle rocks without damage. Make sure the trip/shear function on the plow and Position Control on the tractor are working correctly. It is not difficult to stand a tractor vertically on end, pivoting around the 3-Pt linkage, should these safety features NOT be working, should the plow encounter an immovable object underground.
Adjusting and operating a plow, especially a plow larger than a two-bottom plow, is an intermediate level skill. Do you have someone with experience who can help you get started?
A 12" plow (measure from center of one plow beam, to center of next plow beam) will leave 12" waves in the field. To knock down the furrows, a Disc Harrow is used in succession to the plow.
WHAT IS YOUR OBJECT IN BREAKING THIS LAND? Crop? Pasture? Vhat?
PLOWS & PLOW ADJUSTMENT:
http://www.tractorbynet.com/forums/...oard-plow-wisdom-farmwithjunk.html?highlight=
Picture #3 + #4 Cleaning and lubricating trip plow mechanism.