A method for detecting at least one spray liquid data set of a spray liquid applied to an agricultural area using at least one spray nozzle unit of a spraying device. The method includes receiving a property signal, including a piece of property information of the spray liquid detected using a sensor unit of the spraying device in a through-flow area of the spray nozzle unit during an application operation of the spray liquid； receiving a position signal, including a piece of position information of the spray liquid, using a position unit, the position information representing a geographic position of the spray liquid during the application operation of the spray liquid； and storing the property information and/or a piece of spray liquid information of the applied spray liquid ascertained using the property information, together with the associated position information, using an information unit, for detecting the spray liquid data set.
