| 摘要 |
A soil opening implement comprises a frame (5) adapted to be moved across a ground surface to be opened, a soil opener (1) mounted on a lever (2) pivotally mounted on the frame (5) for a repetitive cyclic movement up and down to cause the soil opener to penetrate the ground at a plurality of spaced positions to form a line of holes in the soil, and means for varying the spacing between adjacent holes in the direction of movement of the implement. |
