Dr.ir. J.J.T.I. Boesten
DLO Winand Staring Centre (SC-DLO)
6700 AC Wageningen
The PESTLA model consists of submodels for water and heat flow and for pesticide behaviour. The submodels for water and heat flow are based on Darcy's law and Fourier's law. The submodel for water flow is SWACROP which implies that a range of upper and lower boundary conditions can be specified. The submodel for heat flow assumes that the surface temperature of the soil is equal to the air temperature. The relationship between heat conductivity and moisture content is fixed. The submodel for pesticide behaviour is based on the convection/dispersion equation for transport in the liquid phase. Transport in the gas phase is ignored. Sorption is described via a Freundlich isotherm and is proportional to organic matter. Transformation proceeds with first-order kinetics and depends on temperature, moisture content and soil depth. Plant uptake of pesticide is passive. Pesticide an be applied to the soil surface or incorporated to a specified depth. The model is used in the Dutch pesticide registration procedure as a first screening tool.SC-DLO DLO Winand Staring Centre, Wageningen UR
Boesten, J.J.T.I., 1994.
Simulation of bentazon leaching in sandy loam soil form Mellby (Sweden) with thePESTLA model.
Journal of Environmental Science and Health A29: 1231-1253
Bosch, H. van den & J.J.T.I. Boesten, 1994.
Validation of the PESTLA model: field test for leaching oftwo pesticides in a humic sandy soil in Vredepeel (the Netherlands).
Report 82, DLO-Winand Staring Centre, Wageningen, Netherlands, 59 pp
Boesten, J.J.T.I., 1993.
User's manual for version 2.3 of PESTLA.
Internal Communication 275, SC-DLO.