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Pesticide Leaching in Polders: Field and Model Studies on Crack Clays and LoamySand

机译:圩区农药浸出:裂缝粘土和壤土砂的田间和模型研究

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This thesis reports on a study of pesticide leaching in polder areas. The studycomprises two aspects: a data collection program and the development, calibration and application of the model SWACRO for the simulation of pesticide transport. Field data were collected at three experimental fields, all situated in the IJsselmeerpolders. The experimental fields were situated on loamy sands and cracked clay soils. Four different pesticides were incorporated in the research program: 1,3-dichloropropene, metamitron, aldicarb and simazine. The soil physical propertes of the experimental fields and the characteristics of the pesticides involved were determined in laboratory experiments. Calibration of the model was performed in three steps: (1) calibration of soil water fluxes, (2) calibration of the concentration of conservative solutes in drainage water and the concentration profiles of conservative solutes, (3) calibration of the concentration of pesticides in drainage water and transformation of pesticides.

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