Like WVBill said, some folks call'em a tater plow 'cause it's great for digging up the potato crop; just drop it in the ground, run down the row and watch it throw dirt and taters both directions./w3tcompact/icons/laugh.gif Of course, if you don't have a moldboard, turning plow, or whatever they call them in your area, you can also use the middle buster to dig deeper than the tiller and just tear up the ground before tilling with the tiller. And of course sometimes the middle buster is used just to make trenches.