The present invention relates to unmanned aerial vehicle for application of an active ingredient to agricultural crops. It is described to hold (410) a liquid comprising the active ingredient in at least one liquid reservoir housed within or attached to the unmanned aerial vehicle. At least one liquid application unit is housed within or attached to the unmanned aerial vehicle, and the at least one liquid application unit is in fluid communication with the at least one liquid reservoir. It further describes the housing (420) of at least one operating unit which is configured to enable the unmanned aerial vehicle to fly. It is further describes the housing (430) of at least one sensor unit which is configured to determine sense information comprising sensing a functioning of one or more of: the at least one liquid reservoir, the at least one liquid application unit, the at least one operating unit. The at least one sensor senses (440) a functioning of one or more of: the at least one liquid reservoir, the at least one liquid application unit, the at least one operating unit and transmits this information to the processing unit. The processing unit determines (450) an instruction to the unmanned aerial vehicle to dock with a base station and get a service from the base station. This determination step comprises utilization of sense information.
