The rotary tiller type GF 400 is suitable as a full width tiller for an optimum seedbed preparation for the cultivation of various vegetables and potatoes. An ideal prepared seedbed is the prerequisite for optimum development of the seed resp. planting tubers. Through intensive soil cultivation, root crop ground preparation is perfectly achieved so that undisturbed growth of the crop can be guaranteed. For conventional hilling (in a second working step) the rotary tiller GF 400 can be modified to be used as a rotary hiller. The machine can be converted from independent rows to a full width tiller with a few simple steps. For the best protection against soil erosion, the tiller can be equipped with the dyking system, called TerraProtect. The rotary tiller GF 400 can also be used in combination with a potato planter, thus enabling soil cultivation and planting in a single pass. For soil cultivation and seeding of fine seeds in a single pass, the rotary tiller GF 400 can be equipped with hydraulically driven ridge pressure rollers and a lifting frame for seeders.