The Danish Pesticide Leaching Assessment Programme. Monitoring results May 1999–June 2022

Nora Badawi, Sachin Karan, Eline B. Haarder, Lasse Gudmundsson, Carl H. Hansen, Carsten B. Nielsen, Finn Plauborg, Kirsten Kørup

Research output: Book/ReportReport (publicly available)

Abstract

In 1998, the Danish Parliament initiated the Pesticide Leaching Assessment Programme (PLAP), an intensive monitoring programme aimed at evaluating the leaching risk of pesticides and/or their degradation products under field conditions. The objective of PLAP is to improve the scientific foundation for decision-making in the Danish regulation of pesticides by enabling field studies to be included in the risk assessment of selected pesticides. The specific aim is to evaluate whether approved pesticides applied in accordance with current regulations and maximum permitted dosages according to crop and BBCH stages, under actual, Danish field conditions can result in leaching of the pesticides and/or their degradation products to the groundwater in concentrations exceeding the limit value of 0.1 μg/L for groundwater and drinking water.

This report focuses on results from the period July 2020 – June 2022. During this period, 21 different products containing a total of 20 different active ingredients were applied to the PLAP fields as part of the agricultural management. Not all active ingredients from these products were selected for testing and therefore not included in the monitoring or presented in this report.

We here present the results of tests carried out on five different fields, of which one is sandy (Jyndevad) and the other four consist mainly of clay till (Silstrup, Estrup, Faardrup, Lund). Additionally, it should be noted that several active ingredients were applied to the fields before July 1, 2020, for which either the active ingredient, degradation product/s, or both were included in the monitoring. In the evaluation of the individual test, we have therefore included the results of analyses before July 2020 in cases where this was needed. A summary of the results is given in Table 0.1 for samples collected from April 2018 to 30 June 2022. In the current report, we present either preliminary or final results of the testing of 21 active ingredients (for simplicity hereafter referred to as pesticides), of which four pesticides and a total of 35 degradation products were included in the monitoring. The pesticides were applied to the PLAP fields by spraying 21 different commercial products. In some cases, the commercial products contained one or more pesticides, and in other cases, the same pesticide was applied to the fields using different commercial products.

Please refer to Table 8.1 and Table 8.2 for a historical perspective of the entire monitoring in PLAP from 1999–2022, which has so far included 156 pesticides and/or degradation products (53 pesticides and 103 degradation products). Detailed information and results of previous tests can be found in previous PLAP reports (e.g. Badawi et al. 2022 and other reports available at www.plap.dk).
Original languageEnglish
Place of PublicationCopenhagen
PublisherGEUS
Number of pages293
Volume2022
ISBN (Electronic)978-87-7871-583-8
ISBN (Print)978-87-7871-582-1
DOIs
Publication statusPublished - 28 Aug 2023

Keywords

  • Denmark

Programme Area

  • Programme Area 2: Water Resources

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