Systems comprising agricultural implements connected to lifting hitches and related control systems and methods

A system, comprising:

• a tractor comprising a lifting hitch;
• an implement comprising an implement frame carried by the lifting hitch, the implement frame having an integrated elongate toolbar carrying a plurality of planter row units, wherein the implement frame is not supported by tires connected to the implement frame;
• a sensor configured to sense a position of at least one planter row unit relative to ground;
• and
• a control system configured to receive a signal related to the sensed position of the at least one planter row unit relative to the ground and cause the lifting hitch to raise or lower at least a portion of the implement frame connected to the lifting hitch relative to the tractor based at least in part on the signal.