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Those are all difficult questions. :) For one, 'disk plows' are vertually unheard of 'here' so I wouldn't know what one is actually good for! :) 'Here' a chisel plow takes 20 hp or more per bottom to do any good - they are meant to go deep & fast, tearing up the ground & shattering it into chunks. 'Here' one would use a regular furrow plow to turn the ground & make it black in fall, get ready to seed anything in spring; disk (disk harrow?) or field cultivate in spring before planting. Most small tractors can't be bothered with a chisel plow. To renovate my pasture I ran the field cultivator through it one spring when it was very dry. Then fertilized & seeded some legumes into the sod. Unfortunately it was a very dry year, & I should have ripped a bit deeper with the field cultivator. But still, got some clover & alfalfa & others established. The disk plow will be good for making the field black & starting over. A regular disk (disk harrow?) or field cultivator will rip up an established pasture a bit to interseed new forage (disk for taller grass, field cultivator for short pasture or it will plug up). I guess a chisel plow would work as a cultivator, but it really is a different implement that what your plan is, normally ripping deeply with much more hp. This makes some big chunks in sod if you really planned on doing heavy tillage. 'Here' chisel plows are used to rip up soybean stubble for next year's corn fields - it leaves some residue on top for erosion control, but breaks up the soil so it dries & warms in the sun next spring. --->Paul
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