A good seed bed preparation is preparing the ground for sowing once-over. With the Steketee Combirol on the front of the tractor and a seed bed combination at the back, this can also be done in more heavy soils. In case of more heavy soil types a second round of work is needed, even with powered implements. Disadvantages of such a second round are extra labour, tracks and a larger chance of soil slaking. The Combirol performs the fist cultivation of the ploughed ground, after which the combination behind the tractor further prepares the seed bed. The machine consists of a frame with an adjustable triangular trestle, shanks with 30 cm bits, Steketee angle bar roller and a smoothing beam. The depth of both the shanks and the smoothing beam can be adjusted. When the smoothing beam is set slightly lower, the ground is thrown into the turning angle bar roller, which has a crushing effect.