i use a 24 ft, VT, they were designed to chop the corn trash about 2 or 3 in deep you want to leave the corn root ball intack to keep the trash from washing in a heavy rain into a big pile in low spots or around open ditches. I run a 5 shant in line ripper in bean ground. Vertical tillage is up and down , a disk is horizontal or moving side ways and compacts the ground,