The side frames positioned on the frame move on axles pointing in the direction of travel. The side frames have at least one three-point coupling (21) possessing a hoist, soil cultivator implements (23), and rollers (23'). A frame (6) is detachably fixed to the travelling chassis (2) on which is the seed storage container (9). The three-point coupling blocks (18,18') are fixed on the frame so that they can be detached and moved into different positions. The frame has two spaced apart support arms (25) on which is a connecting beam (26) for the three-point couplings.