Agricultural implements having row unit position sensors and a rotatable implement frame, and related control systems and methods

An agricultural system, comprising:

• an implement comprising an implement frame, the implement frame having an integrated elongate toolbar carrying at least one row unit;
• at least one wheel coupled to the implement frame forward of the toolbar and defining an axis of rotation;
• a sensor configured to sense a position of the at least one row unit relative to a ground surface;
• and
• a control system connected to a lift system, the control system being configured to receive a signal related to the sensed position of the at least one row unit relative to the ground surface and vertically adjust the lift system based at least in part on the signal;
• wherein the at least one wheel is coupled to the implement frame in a manner such that vertically adjusting the front portion of the frame rotates the implement frame about the axis of rotation;
• and
• wherein the at least one wheel is coupled to the implement frame in a manner such that upward movement of the front portion of the frame rotates the implement frame about the axis of rotation to cause downward movement of the toolbar.