#$%^&*AU2018203618A120180614.pdf#####SYSTEMS, METHODS, AND APPARATUS FOR AGRICULTURAL IMPLEMENT TRENCH DEPTH CONTROL AND SOIL MONITORING ABSTRACT A monitoring system for an agricultural implement having a plurality of row units comprising: a soil reflectivity sensor comprising light-emitting diodes and disposed in an implement associated with at least one row unit and configured to resiliently engage a bottom of a trench opened by said at least one row unit to measure light reflected from a soil surface within said trench; and a processor in electrical communication with said soil reflectivity sensor.