| 摘要 |
A soil contacting implement and depth gauging wheel at a predetermined vertical distance from the implement are provided for attachment to a tractor. Upward or downward movement of the wheel on the soil causes a deviation from the predetermined vertical displacement thereby triggering an adjustment to the downward force on the implement so as to reestablish the predetermined displacement. The magnitude of the predetermined displacement manually may be altered. In addition, the downward force of the wheel manually is adjustable without altering the magnitude of the predetermined displacement.
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