Abstract: According to an aspect, a system for monitoring crops and soil conditions below a crop canopy includes a retractable boom assembly adapted to be coupled to an unmanned aerial vehicle. Further according to this aspect, the boom assembly includes an actuator and an elongate probe is coupled to the retractable boom assembly. Still further, the system includes a controller for maneuvering the elongate probe below the crop canopy while the boom assembly is extended by the actuator.