Summary
This comprehensive field survey of 100 agricultural sites across Europe demonstrates that pesticide residues persist ubiquitously in both organically and conventionally managed soils, albeit at substantially lower levels in organic fields. Notably, pesticide residues remained detectable even after 20 years of organic management, and their presence was significantly negatively associated with soil microbial life, particularly arbuscular mycorrhizal fungi—key plant symbionts. The findings suggest that legacy pesticide contamination is a hidden but consequential factor shaping soil biological communities in agroecosystems.
UK applicability
These findings are directly applicable to UK agricultural soils, where organic farming has expanded significantly and similar legacy contamination from conventional practices is likely present. The study's demonstration that microbial soil health is linked to pesticide residue burden has implications for UK organic certification standards and soil monitoring practices, particularly given the UK's policy emphasis on environmental land management schemes.
Key measures
Number and concentration of pesticide residues (46 pesticides across 16 herbicides, 8 herbicide transformation products, 17 fungicides, 7 insecticides); microbial biomass; arbuscular mycorrhizal fungal abundance; duration of organic management
Outcomes reported
The study screened 100 fields under organic and conventional management for 46 pesticides and measured pesticide residue occurrence, concentration, and their relationship to soil microbial biomass and arbuscular mycorrhizal fungi. Pesticide residues were quantified across both management types and correlated with soil biological indicators.
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