Microplastics in Farm Soils Are Carrying Pesticides and Germs, EU Research Finds
Microplastics in farm soil act like a Trojan horse, moving pollutants, pesticides and bacteria through soil systems. That is the finding of a five-year, EU-funded multinational research project, published on 16 September 2026. The Guardian
The project is MINAGRIS, short for Micro- and Nano-plastics in Agricultural Soils. It is funded by the European Union's Horizon 2020 research and innovation programme under grant agreement number 101000407. The work has so far produced 22 peer-reviewed studies.
Researchers tested 227 farm fields across 11 European countries. Microplastics were present in the soil of every field. Every field tested positive. The Guardian
The 11 MINAGRIS case study sites include the Netherlands, Slovenia, the UK, Greece, Switzerland, Austria, Italy, Spain and France. EU CAP Network The stated focus is how micro- and nano-plastics affect farm soils, biodiversity and plant productivity. MINAGRIS
Microplastics can combine with other farm pressures such as pesticides and veterinary drugs. The surface of each particle, known as the plastisphere, forms a hotspot where plastics, microbes and farm chemicals meet. Researchers found more antibiotic-resistance genes in plastispheres than in controls, and pesticides appeared to increase this effect. The Guardian
Size matters. The smaller the piece, the more it tends to adsorb pollutants, microbes and DNA. Adsorb means substances stick to the surface. This can potentially increase the spread of pathogens and antibiotic-resistance genes. A study in Switzerland found fields with the highest levels of tyre-wear particles also had the highest levels of other toxic chemicals and metals.
The carrying effect can affect earthworms and soil organisms by disrupting processes such as nutrient cycles. In lettuce, higher concentrations of microplastics reduced leaf area, chlorophyll content, photosynthetic efficiency and plant biomass. When drought was combined with microplastics, harm to plants was greater than with either pressure alone. The Guardian
Biodegradable plastics were not automatically safer. They could still break down into microplastics, with possible ecological harm. Once broken into fragments in the ground, plastics are practically impossible to remove. They act as carriers for farm chemicals while changing soil ecosystems, according to researcher Esperanza Huerta Lwanga of Wageningen University.
Soil has received less public attention than marine plastic, but some studies have estimated that soils are more polluted by microplastics than the oceans. AP News French scientists believe microplastics are now widespread in the Mediterranean Sea, posing significant health, environmental and economic risks. Reuters U.S. agencies will monitor drinking water for microplastics and pharmaceuticals. Reuters
The broader context here is policy. The MINAGRIS results shift the question from presence to interaction. Ubiquity alone did not define risk. Co-exposure did. Plastics plus pesticides, plastics plus veterinary drugs, and plastics plus drought produced joint effects that testing one pressure at a time would miss. For regulators used to assessing chemicals substance by substance, that complicates thresholds, monitoring design and field-level guidance.
In my view, three threads will shape what follows. First, tyre-wear particles and sewage-derived inputs deserve closer scrutiny as pathways, given the Swiss link between tyre-wear load and metals and toxics. Second, the plastisphere finding on resistance genes, increased by pesticides, links soil management to antimicrobial resistance policy, two areas that rarely share tools. Third, the caution on biodegradable plastics challenges buying assumptions. Breakdown in principle is not safety in soil under real farming conditions.
Looking ahead, none of this settles dose-response for humans, or the economics of alternatives for mulch films, coatings, composts and sludges. It does narrow the next research frontier. Smaller fractions, longer exposures, and mixtures as they occur in working fields.
