The seeder (1) has implantation units (5) arranged on a line (7) perpendicular to advancing direction (A), where a placement element is followed by a control wheel (6). A sowing bar (4) is connected to a frame (2) by a connecting device (9). Two arms (10, 11) are hinged to the connecting device, which is deformed by an adjustment unit (12) for changing drilling depth. The arms of the connection device are arranged in a converging position rearwardly such that an intersection point (X) lies behind a vertical plane (P1) passing through a foremost point of the placement elements.
