JoBob, I like that approach of having the Curvetine on the undisturbed side and the rubber tire on the 2x2 fertilizer coulter side, especially in the heavy clay of many areas of WC WI.

If the single angle disk OEM fertilizer coulter can be shifted so it is still putting fertilizer down 2" to the side of the seed but fractures TOWARD the seed rather than away from the seed this method works even better.

Jim at Dawn