On a recent bright, clear day in eastern Nebraska, a small red machine crept through a lush field of soybeans. From the highway, it looked like a small tractor. Up close, its mess of wires came into focus. So did the laptop strapped to the back. This is the Flex-Ro (Flexible Robotic Unit), one of several robots across the world being designed and tested to help farmers maximize crop yield, use fewer pesticides, and manage the industry’s dwindling labor market.