Methods and systems for automatic inventorying and reporting of field operations are presented. The invention provides a method for automatically reporting the completion of a field harvest or product application. An apparatus data unit can transmit apparatus location and state data to a central inventory system (CIS), preferably embodied as a central server. The CIS can convert the apparatus data to agricultural elements that can be mapped to a business state for a particular field. The CIS can provide a report of the field business state to an administrative service for scheduling or billing purposes. The invention provides a layer of abstraction so that a report recipient need not have familiarity with agricultural terms in order to perform administrative tasks related to field and fleet management. The invention enables resource management and billing services to be performed in a timely, efficient and accurate manner.