Abstract: A truck mounted particulate material ground spreading apparatus mixes substantially dry particulate material with from 7-20% of water w/w immediately before supplying the wetted particles to a spreader disc to spread the wetted particles onto the ground. The apparatus (4) has a plurality of grinding discs (12a, 12b, 12c) above a mixing chamber (7) so that particulate material can be dry ground before mixing with water in the mixing chamber (7) and delivery to the spreader disc (19). The grinding discs (12a, 12b, 12c) and spreader disc (19) are mounted on a common shaft (14) driven by a hydraulic motor.