I have recently read that AGs require "sandy loam" or "loose" soil to a depth of 1 meter (3 feet). My soil is clay to a depth of 20 feet I suspect. rototilling can only affect a depth of 8 inches or so. Is there a way around this dillemma? is it really important to be that deep? or should I just bite the bullet and bring in a dozer and do it right? Thank You Mark