Abstract: Soil cultivating apparatus is provided including a cultivating tool for entering into the soil, and control means responsive to the force exerted on said tool by an obstacle encountered by said tool as the tool is drawn through the soil to lift the tool out of the soil. In a preferred embodiment a spring biased latch holds a control arm hinged to a secondary member itself hinged to the main frame of the apparatus, and the soil-cultivating tool extends from the control arm. A ground engaging pad on the control arm levers the tool out of the ground when the tool is released by the latch in response to an excessive force thereon due to the obstacle.

Abstract: A direction of movement sensing apparatus is shiftably supported from the wheel track filling structure of a wheeled support tower for an irrigation pipe and is operative to shift between a first inoperative position assumed thereby when the tower is moving in a forward direction toward a second operative position relative to the wheel track filling structure when the tower is moved rearwardly over the ground. Connecting structure is provided and operatively connected between the direction sensing apparatus, the wheel track filling structure and the tower for raising the wheel track filling structure responsive to movement of the sensing apparatus to the second operative position thereof and thus enabling the tower to move rearwardly without damage to the wheel track filling structure.