Going 10" deep you are going to be limited by horsepower and traction. You will need a heavy offset plowing disc,with at least 28-30+"diameter blades to get in 10" in the soil mixture/root mat you have to cut. The biggest you will be able to pull sucessfully at 4-5mph is about a 10 ft on the 110 HP tractor, and maybe a 8 footer on the smaller tractor.I can spin out a dualled up/heavily weighted 4960JD with an 18 foot Tatu with 36 in blades in similar soil. Here's a horsepower chart for the heavy off set Tatu discs
Number of Disk Blades Working Width ft. in. (mm) Disk Blade Dimensions Disk Blade Spacing Weigth per Disk lbs (kg) Approx Net Weight* lbs (kg) Tractor Drawbar Horsepower** 10 5' 10" (1,800) 36" x 12mm 673 (305) 6,733 (3,054) 130 - 140 12 7' 3" (2,200) 38" x 12mm 17 5/16" 625 (283) 7,500 (3,402) 145 - 155 16 10' 2" (3,100) and (440mm) 660 (299) 10,553 (4,787) 205 - 220 20 13' 1" (4,000) 40" x 12mm 660 (299) 13,198 (5,986) 260 - 280 *Approximate Net Weight with 36" x 12mm disk blades
Taking all this into account, with both tractors,you might get over 40-50 acres in a 10 hr day,and $70/hr is not out of the question. Figure $12+hr for operator,$30/hr for fuel and maintenance, another $10/hr to cover breakdowns,wear and tear, then add in something for equipment depreciation, and add some some margin of profit ($7-$10/hr),if you don't tear a $900 tire
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