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Stochastic Modeling of Diffuse Pesticide Losses from a Small Agricultural Catchment

^a Department of Soil Sciences, SLU, Box 7014, 750 07 Uppsala, Sweden
^b Department of Microbiology, SLU, Box 7025, 750 07 Uppsala, Sweden
^c Sida, Dusjanbe (DHL), 105 25 Stockholm, Sweden
^d Institute of Terrestrial Ecology, ETH Zürich, CH-8952 Schlieren/Zürich, Switzerland

View larger version (28K): [in a new window]   Fig. 1. Measured and predicted (stochastic and deterministic) outflows from the Näsbygård field site for a 40-d period following pesticide application on 21 May 1999.

View larger version (30K): [in a new window]   Fig. 2. Measured and predicted concentrations of MCPA in outflow from the Näsbygård field for a 40-d period following pesticide application on 21 May 1999. Filled circles represent samples with concentrations below the limit of detection.

View larger version (27K): [in a new window]   Fig. 3. Measured and predicted outflows from the Vemmenhög catchment during January 1993 to December 1999. Summer outflows in 1993, 1995, 1997, and 1999 are enlarged.

View larger version (20K): [in a new window]   Fig. 4. Measured and predicted concentrations of MCPA above the limit of determination (LOD) at the catchment monitoring station. The dotted line marks the LOD. A total of 46 measured concentrations and 113 simulated concentrations were less than the LOD. Simulated concentrations were averaged to match the time resolution in the measurements (composite samples taken once or twice weekly).

View larger version (22K): [in a new window]   Fig. 5. Measured outflow and concentrations of MCPA in the outflow from the Vemmenhög catchment in 1997.