Remarks for CropPrduction. In the planning stage an Operation is planned for a CropField. when assigned to a Task, it will be valid for an ActivityField. A measurement with a sensor system or soil sampling can also be called an Operation. Examples for CropProduction: The CulturalPractise weed control can be realized by one of various OperationTechnique's like spraying, row cultivation, manual hoeing, etc. Examples for AnimalHusbandry: To be specified