Chisel plows are going to roll a lot of rock to the surface. A lot.. Get one with a good spring action, when they hook a big rock something has to give.
Chisel plow does a better job if it has a curved twist shovel on it, and if you go 2 inches deeper than you plowed to break up the plow companion layer, and if you drive a little faster it shatters the diary better. All of which to say, the more hp per shank the better, I got a 7 shank Soil Saver behind a 150hp tractor in my heavy soil, some years it is a little small, but dry years when it does the best job it can pull the engine down in hard clay doing its job.
I had - still have - a lighter old 2 inch point chisel p.ow, but when the ground was hard it kinda danced over the ground and you could still see the rows, really didn't do that much, wondered why I bothered. Could pull 10 shank shallow with 85hp, but like I say it didn't really seem to do anything for my dirt.
All to say, an M might be a little light to accomplish much chisel plowing.
We bought 55 acres this spring where the previous owner grew corn on corn, didn't pick many rock ever. Boy howdy did the wife and I get a workout, we didn't get all 55 acres but I covered the 35 acres with a couple Polaris Ranger loads full (hitch was actually dragging on the ground, I should made more small loads...) and wife got through 10 of the 20 acre field with 4 Ranger loads and a loader bucket plumb full of bigger ones, bless her. I think I got 2 more Ranger loads after I planted. Still didn't do much to the other half of that field and we need to do better on the 35 acres next spring. But we got the bigger than football size ones at least.
You will find rock you didn't know you had the first time through......
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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