How are GeoPEARL assessments carried out?

1

• How are GeoPEARL assessments carried out?
• GeoPEARL is run for 250-6405 plots, depending on
  spatial detail wanted

• The model is run for the area of potential usage
  only. This area is assumed equivalent to the area
  of the crop(s) for which a registration is
  requested
• For each plot and crop-type, the model is run for
  26, 46 or 66 years (FOCUS procedure)
• For each plot the median leaching concentration
  in time is extracted and put into a map.

2

• To be specified by the user
• Substance properties (start withstandard
  dossier)
• Application schedule
• Number of plots (i.e. spatial detail wanted)
• One or more crops for which a registration is
  requested

3
Effect of area of use on pesticide authorisation
(1)
4
Effect of area of use on pesticide authorisation
(2)
Substance with pH-dependent sorption behaviour
5

• The target variable produced by the model
• The 90th percentile in space and the 50th
  percentile in time of the leaching concentration
  at 1 m depth at the area of (potential) usage

6
Effect of area of usage on authorisation (cntd.)
Unsafe in potatoes Safe in maize
7
Some conclusions from previous section

• GeoPEARL explicitly considers the variation of
  the leaching process, so that it is now possible
  to evaluate the leaching for different crop types
• Consideration of the area of usage can have a
  strong effect on the authorisation decision