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No set answer. Too many variables. I have been trying to get the right combination of plow type, width and tractor to do my primary plowing. I think I am there finally. I also think that for a disc/disc type harrow to be used as a plow, you need to move at a reasonable speed to get the dirt to break up and lay right. Around here, the plow of choice is the disc harrow type. Soil is heavy Houston clay and can be go from goo to rock hard; can't plow either. Sod breaking, vs first cut of an existing field in preparation for next year's crop, vs cleaning up weeds emerging on recently plowed ground, vs just wanting to break up clods, all have their own uniqueness. I use two discs and a spike (sweeps) cultivator to do my tillage. The first is a medium-heavy duty JD H1120 (11' 20" deep cone discs)tandem disc "harrow" which is "my plow". I run this in B1-B2 of a C4 (16 sp) tranny on a JD 4230 with cab rated about 85 drawbar, 100 PTO. The tractor usually works it's way up to redline temp after a couple of hours of running on a hot day with the AC running but I want the speed to get the dirt breaking the way I want it to , like I said. So I plow for a couple of hours and go home and do something else. Next comes a regular disc 11' medium duty tandem with 18" discs which I run in B2-B3. The lightest is a 11' cultivator with 15 10" sweeps and 3 rows of spring fingers that I run on my new Branson 57 PTO or Ford 4600 52 PTO in a medium gear. Just to give you some idea as to what I have found to work for me over the years. Mark
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