Application of the pesticide transport assessment model to a field study in a humic sandy soil in Vredepeel, The Netherlands
✍ Scribed by Tiktak, Aaldrik; van der Linden, Anthonius M. A.; van der Pas, Leo J. T.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 472 KB
- Volume
- 52
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
The Pesticide Transport Assessment model (PESTRAS) is a processoriented model to simulate the fate and movement of water and pesticides in a cropped Ðeld soil. The model was evaluated using Ðeld data for bromide, ethoprophos and bentazone, collected from a Ðeld experiment in a humic sandy soil near Vredepeel, the Netherlands. Model predictions were generally within the 95% conÐdence intervals of the observations when site-speciÐc model inputs were used. If generic parameter values were used, the model predictions sometimes deviated strongly from the observed data. This was especially true for pesticide degradation properties. The bromide simulations showed that preferential Ñow was not an important process for this Ðeld soil. A signiÐcant fraction of the applied ethoprophos disappeared by surface volatilization. The downward movement of this pesticide was slightly overestimated, due to not considering sorption kinetics. The depth-dependence of pesticide transformation was atypical : an important fraction of the applied bentazone was transformed under micro-aerobic to anaerobic conditions in the subsoil.
1998 SCI (