A soil opener comprises first and second soil-cutting members (20,1). The first member (20) has a first soil-engaging surface (20") inclined at a first angle (H) to a perpendicular (V) to the soil surface (G) when viewed along a travel direction, the first angle (H) being greater than zero, and at a second angle (J) to the travel direction when viewed along a perpendicular (V), the second angle (J) being greater than zero. The second member comprises a rotating disc (1) and has a second soil-engaging surface (1") that faces away from, and in a substantially opposite direction to, the first soil-engaging surface (20"), the second soil-engaging surface (1") being inclined at a third angle (F) to a perpendicular (V) when viewed along the travel direction, the third angle (F) being greater than zero and in the same sense as said first angle (H).
