Abstract: A ditch forming apparatus includes a pair of discs rotationally mounted in a back-to-back arrangement to a support frame with their respective convex surfaces in facing relation and their concave surfaces directed outwardly. The discs are oriented in an angled manner relative to the direction of displacement of the support frame such that the leading edges of the discs overlap along the displacement direction, with one disc positioned aft of and lower, or deeper in the soil, than the other disc to compensate for the increased drag imposed on the forward disc in providing straight tracking for the apparatus through the soil. Drag compensation may also be provided by orienting the aft disc at a greater angle relative to the direction of displacement of the apparatus than the forward disc.