Abstract: Computer-implemented method for providing application data for an agricultural field, comprising the following steps: providing an application rate model for a plant, wherein the application rate model is configured to describe a relationship between a nitrogen content and an application rate of a glutamine synthetase inhibitor (S10): obtaining nitrogen content data of at least a section of the agricultural field (S20); providing the nitrogen content data of the at least one section of the agricultural field to the application rate model (S30); determining the application rate of the glutamine synthetase inhibitor of the at least one section of the agricultural field using the application rate model (S40); providing the application rate of the glutamine synthetase inhibitor for the at least one section of the agricultural field (S50).