Coordinator : Pierre Benoit
The scientific questions treated are :
The main scientific questions concern understanding and modelling the processes which determine the fate of pesticides in soils, with their interactions and retroactions.
One of the present barriers for modelling the (bio-)availability, and so predicting ecotoxicological effects, and the leaks toward waters and air, lies in the influence of hydric conditions, changing with climatic and agronomic constraints (crop succession, intercropping, plant association, soil tillage).
Modelling tasks are especially pursued in the frame of projects. E.g., CIREPPE is focused on the role of intercrop plant covers and uses recent developments of a general model of pesticide fate and transport (routines PASTIS-Mulch, Coupling DOC-Organic Pollutant).
Furthermore, the explicit spatial description of pores for modelling coupled physical and biological processes, taking into account the soil heterogeneity at a microscopic scale, provides a key for understanding the influence of hydric conditions on the dynamic of organic pollutants in different types of soils.