BOOK OF ABSTRACTS 217 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Hall A Poster Session / Environment, Agriculture, and Forestry P4.2 Influence Of Secondary Plant Metabolites on Degradation of Pesticides in Agricultural Soils Irmina Ćwieląg-Piasecka1, Dorota Kawałko1, Elżbieta Jamroz1, Daria Szuk1, Iwona Gruss, 1 Bogna Kosyk1, Dariusz Drożdżyński2, Rafał Motała2, Marek Szczepański2, Ladislav Holík3, Valerie Vranová3, Lubica Pospíšilová4 1 Department of Soil Science, Plant Nutrition and Environmental Protection, Wrocław University of Environmental and Life Sciences, Grunwaldzka 53, 50-357 Wrocław, Poland; irmina.cwielag-piasecka@upwr.edu.pl 2 Institute of Plant Protection – National Research Institute, Department of Pesticide Residue Research, Władysława Węgorka 20, 60-318 Poznań, Poland 3 Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Geology and Soil Science, Zemědělská 3, 613 00 Brno, Czech Republic 4 Mendel University in Brno, Faculty of AgriSciences, Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Zemědělská 1, 613 00 Brno, Czech Republic Modern intensive agriculture is inextricably linked with the widespread application of plant protection products, with global usage reaching millions of tons annually. While these substances are essential for securing crop yields, their long-term accumulation in the soil matrix poses a significant threat to environmental sustainability. Pesticide residues can persist far beyond their predicted half-lives, leading to the degradation of soil health, contamination of groundwater, and disruption of vital ecosystem services such as nutrient cycling and organic matter turnover. Current research often focuses on abiotic factors like pH or organic matter content, yet the biochemical role of the rhizosphere remains insufficiently understood. This study addresses a critical knowledge gap: the potential of secondary plant metabolites (SPMs) to act as natural mediators in the dissipation and detoxication of synthetic agrochemicals. The primary objective of this project is to provide a comprehensive evaluation of how specific SPMs, particularly phenolic acids (such as p-hydroxybenzoic, vanillic, syringic, and p-coumaric acids), influence the degradation kinetics of five chemically diverse pesticides: fluroxypyr, acetamiprid, pirimicarb, tebuconazole, and azoxystrobin. We aim to test the hypothesis that these naturally occurring compounds can stimulate soil microbial communities and modulate redox conditions, thereby accelerating the breakdown of persistent residues. Furthermore, the study seeks to determine whether the presence of SPMs can mitigate the ecotoxicological pressure exerted by pesticides on non-target soil organisms, effectively acting as a nature-based solution for soil remediation.
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