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Identification of key climatic factors regulating the transport of pesticides in leaching and to tile drains

Lookup NU author(s): Professor Hayley Fowler, John Richmond

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Abstract

BACKGROUND: Key climatic factors influencing the transport of pesticides to drains and to depth were identified. Climatic characteristics such as the timing of rainfall in relation to pesticide application may be more critical than average annual temperature and rainfall. The fate of three pesticides was simulated in nine contrasting soil types for two seasons, five application dates and six synthetic weather data series using the MACRO model, and predicted cumulative pesticide loads were analysed using statistical methods. RESULTS: Classification trees and Pearson correlations indicated that simulated losses in excess of 75th percentile values (0.046 mg m-2 for leaching, 0.042 mg m-2 for drainage) generally occurred with large rainfall events following autumn application on clay soils, for both leaching and drainage scenarios. The amount and timing of winter rainfall were important factors, whatever the application period, and these interacted strongly with soil texture and pesticide mobility and persistence. Winter rainfall primarily influenced losses of less mobile and more persistent compounds, while short-term rainfall and temperature controlled leaching of the more mobile pesticides. CONCLUSIONS: Numerous climatic characteristics influenced pesticide loss, including the amount of precipitation as well as the timing of rainfall and extreme events in relation to application date. Information regarding the relative influence of the climatic characteristics evaluated here can support the development of a climatic zonation for European-scale risk assessment for pesticide fate. © 2008 Society of Chemical Industry.

Publication metadata

Author(s): Nolan BT, Dubus IG, Surdyk N, Fowler HJ, Burton A, Hollis JM, Reichenberger S, Jarvis NJ

Publication type: Article

Publication status: Published

Journal: Pest Management Science

Year: 2008

Volume: 64

Issue: 9

Pages: 933-944

Date deposited: 12/05/2010

ISSN (print): 1526-498X

ISSN (electronic): 1526-4998

Publisher: John Wiley & Sons Ltd.

URL: http://dx.doi.org/10.1002/ps.1587

DOI: 10.1002/ps.1587

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