FORMULATION OF A SOIL-PESTICIDE TRANSPORT MODEL BASED ON A COMPARTMENTAL APPROACH

A one-dimensional semi-analytical pesticide transport model is formulated based on a compartmental approach to determine the spatial and temporal distribution of pesticide residues across a soil profile. Schematic representation of crop-root and vadose zones with multi-compartments is discussed. Continuous flow stirred tank reactor (CSTR) approximation is analysed under assumption of a two site model for sorption kinetics. Validation and comparison to analytical solution. The CSTR model is presented with nonlinear kinetic sorption or radial diffusion model and a radial diffusive penetration model (RDP). Application at atrazine transport in a simplified soil profile.