A row unit (118, 18) for a seeding machine. The row unit (118, 18) includes a frame (130, 14, 30), a furrow opener (134) coupled to the frame (130, 14, 30), and a position sensor (148A, 148B, 148C, 148D, 148E, 148F, 148G, 148, 150) assembly having a position sensor (148A, 148B, 148C, 148D, 148E, 148F, 148G, 148, 150) configured to detect wear of the furrow opener (134).