In pesticide registration procedures, several stages can be distinguished. In first tier (i.e. initial) assessments, models are used to get a first indication of the leaching potential of a pesticide. To avoid user subjectivity during these initial assessments, target quantities and standardized scenario's have been developed by the Forum for International Co-ordination of pesticide fate models and their Use (FOCUS). Scenario's as defined by the FOCUS modeling working group are a combination of crop, location, the long-term application schedule (i.e. annual, biennial or triennial applications) and agronomic parameters (particularly irrigation data). Scenario's have been developed for 9 locations and approximately 14 crops per location. For more information about FOCUS, refer to the FOCUS website.
Please notice that the FOCUS website is the only place where you can get the approved model versions and scenario's, which are used in the first tier of the EU review process according to Council Directive 91/414/EEC.
In FOCUS scenario's, most model inputs are fixed. The following information can be edited by the user: