- Feb 21, 2012
- JD870,JD X320,MF1529
i use a 3 point mounted single shank sub soiler attachment i bought from tractor supply. i pull it with my john deere 870. it can go down to about 16 inches in the soil.does a good job of breaking up the soil. then the tiller or disc can do a much better job of preparing the site for planting.