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Agricultural machine that includes a roller (10) and a frame of support dragged by tractor (24), including this roller at least a tube (12) mounted in rotation around a horizontal axis (XX) on bearings (22) together with the support frame, being the provided tube of a series of tires (16) introduced in this tube and that presents/displays apt vaulted respective profiles circumferential to form in the Earth a series of parallel furrows, characterized because it includes means of braking (28, 30, 32, 34) apt to exert of controlled form a resistant pair between the frame of support and the central tube.