E. Deep rip or aerate your growing crop to enhance root growth. Deep tillage should only be done under dry conditions. Under moisture saturated conditions roots will grow slowly every day. Bring no soil from the anaerobic zone to the soil surface. The anaerobic zone must not be disturbed to the extent that platelets slide and shear plant rootlets.
Narrow rows require more care here than wider rows.
In early years of a deep ripping program, anhydrous knives work better than a sub-soiler to fracture the plow pan during the growing season. There are deep tillage tools available such as the Blue Jet sub tiller and the Strohm no-till aerator that are a compromise between the two above tools. You may need to rip every other row because of power requirements. If so, skip the tractor wheel tracks and rip at least one side of each row. Consider modifying your cultivator so that you can deep rip and cultivate at the same time.