Abstract: A system (1000) and method of marking soil or crops within afield with a visual strip (1001) to identify an occurrence of a detected event as an agricultural implement (10) traverses a field. The system includes an assembly (100, 200, 300, 500, 700, 800, 900) supported by the agricultural implement. The assembly includes a supply of a colored composition and an actuator (130, 330, 1030) configured to receive the actuation signals sent by the controller (80, 81). The actuator is responsive to the actuation signals to release the colored composition at the location on the field while the agricultural implement advances through the field in the forward direction of travel.