Modeling Pesticide Leaching and Dissipation in a Mediterranean Littoral Greenhouse
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- 作者：James A. Garratt ; Angela Kennedy ; Richard M. Wilkins ; Marí ; a Dolores Ureñ ; a-Amate ; Emilio Gonzá ; lez-Pradas ; Francisco Flores-Cé ; spedes ; Manuel Ferná ; ndez-Perez
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2007
- 出版时间：August 22, 2007
- 年：2007
- 卷：55
- 期：17
- 页码：7052 - 7061
- 全文大小：176K
- 年卷期：v.55,no.17(August 22, 2007)
- ISSN：1520-5118
文摘
The one-dimensional chromatographic flow model PEARL was used to simulate the movement ofthe insecticide imidacloprid and the fungicide procymidone through a greenhouse soil. The modelwas parametrized using measured and literature values of soil hydrological parameters. Soil watermovement and soil temperature were reasonably well described by the model. The ability of PEARLto simulate the fate of imidacloprid and procymidone following four applications of each compoundwas evaluated against greenhouse data. Simulated imidacloprid residues in the 0-10 cm layer werein good agreement with measured data. Below 10 cm, the model overestimated imidacloprid remainingfollowing the spray applications, whereas simulated residues following the chemigation applicationswere in reasonable agreement with measured data. Simulated residues of procymidone in the 0-10cm layer were in general agreement with measured values. In the 10-20 cm layer, peaks in simulatedconcentrations occurred later than observed in the greenhouse. Predictions of procymidone residuesbelow 20 cm were poor and underestimated compared to the measured data. For both pesticides,discrepancies between modeled and measured data in the 10-20 cm layer were attributed to thedrip irrigation method used in the greenhouse. The model was unable to satisfactorily predict pesticidemovement from the soil surface by irrigation water unless the scenario was modified to reflect thelocalized pattern of water application. Scenario analysis indicated that air boundary layer thicknessis a key parameter for readily volatilized pesticides such as procymidone. This is of particular relevanceto the greenhouse environment, where the boundary layer thickness may be greater than that inoutdoor conditions.