Page 100 - Modelisation du devenir des pesticides...

Chapitre 3 Evaluation du modèle STICS version pesticide sur différents sites
expérimentaux
similar for the 3 pesticides, since above 60% of pesticides have been degraded by
120 DAA. The fraction of pesticide that is not degraded is either mostly stored in
a non-equilibrium phase (for isoproturon and atrazine,) or leached downward (for
bentazon). The behavior simulated between the top soil and the 1st soil meter is
consistent with the observations at Vredepeel (Fig. 3.3.4), although the recovery
mass is overestimated at 1m depth.

3.3.6 Comparison with other pesticide fate models

Several pesticide models have already been tested with the dataset from Vre-
depeel, Kerlavic or Grignon. The results obtained previously with the different
pesticide transport models are compared to the STICS predictions below.

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Table 3.8 – Comparison of the statistical results obtained by Stics with other
pesticides models based on literature review analysis ; At Vredepeel
model efficiency and NRMSE are computed using only 3 sampling
dates the 103, 278 and 474 DAA ; and the values presented in bra-
ckets are the results of the simulations carried out with calibration ;
at Thiverval-Grignon, the values are computed on the top 10 cm ; at
Kerlavic, bias is provided for year 2002/2003. References are indica-
ted : 1(Boesten and Vanclooster 2000)71, 2 (Tiktak 2000)69, 3 (Baer,
1997), 4(Guimont, 2005)56.

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