17 September 2026 Punjab Khabarnama Bureau : Microplastics in agricultural soil may pose a wider environmental threat than previously understood, with new research showing that the tiny plastic particles can act as a “Trojan horse” for pollutants, pesticides, microbes and antibiotic-resistance genes.
A five-year, EU-funded multinational research project found microplastics in all 227 agricultural fields tested across 11 European countries. Researchers said the particles can provide surfaces where chemicals and microorganisms accumulate, potentially allowing them to move through soil and enter wider ecosystems.
How the ‘Trojan Horse’ Effect Works
Microplastics do not necessarily remain chemically inert after entering the environment.
As plastic particles weather under sunlight, mechanical abrasion and other environmental conditions, their surfaces can become rougher and chemically more reactive. This can increase their ability to attract and hold pollutants and microorganisms. A recent review describes microplastics as dynamic interfaces capable of carrying chemical and biological contaminants.
Researchers say this creates a “Trojan horse effect”, in which pollutants or microbes hitch a ride on plastic particles and may subsequently be transported to organisms or different parts of the environment.
Microplastics Can Carry Toxic Chemicals
Studies have found that microplastics can accumulate contaminants including heavy metals, persistent organic pollutants, PFAS and other chemicals on their surfaces.
A study conducted in Switzerland as part of the research project found that agricultural fields with higher concentrations of tyre-wear particles also had higher levels of other toxic chemicals and metals.
This means the environmental impact of plastic contamination may extend beyond the plastic particles themselves.
The ‘Plastisphere’ Creates a Microbial Habitat
Another concern is the formation of microbial communities on plastic surfaces, sometimes referred to as the “plastisphere.”
These biofilms can create habitats where microorganisms interact closely with each other, chemicals and the plastic surface. Researchers found an increase in antibiotic-resistance genes within these plastic-associated microbial communities compared with control environments, while pesticides appeared to amplify the effect.
The concern is that close contact between microorganisms may create conditions favourable to the exchange of resistance genes.
Impact on Soil Organisms
Microplastics can also affect organisms that play important roles in maintaining healthy soil.
One study within the multinational project found that microplastic exposure could affect earthworms and other soil organisms, potentially disrupting processes involved in nutrient cycling.
Earthworms are important contributors to soil structure and microbial ecosystems, meaning changes to their environment could have consequences beyond the organisms themselves.
Crops Can Also Be Affected
The research found evidence that microplastic exposure can interfere with plant growth and function.
In one experiment involving lettuce, higher concentrations of microplastics were associated with reductions in leaf area, chlorophyll content, photosynthetic efficiency and plant biomass.
The effects became more pronounced when plants were simultaneously exposed to drought conditions, suggesting that microplastics could interact with other environmental stresses rather than acting independently.
Soil May Hold More Microplastics Than Expected
Recent scientific reviews have increasingly highlighted agricultural soil as an important reservoir of micro- and nanoplastics.
A 2026 review published in Discover Environment said microplastic contamination can alter soil structure, nutrient cycles and microbial processes, potentially affecting soil fertility and crop production.
Another review in npj Soil Ecology said soils can contain substantial levels of micro- and nanoplastics and that these particles can alter rhizosphere properties and microbial dynamics.
Agricultural Plastic Is One Source
Plastic films used in agriculture are among the potential contributors to soil contamination.
A 2026 review in Nature Reviews Earth & Environment estimated that agricultural plastic films generate 3–5 million tonnes of largely unmanaged waste each year, with films gradually fragmenting into microplastics and nanoplastics.
Other sources include tyre wear, sewage, plastic waste, wastewater and the breakdown of larger plastic items.
Even Biodegradable Plastics Need Scrutiny
The research also challenges the assumption that biodegradable plastics are automatically harmless once they enter soil.
Researchers involved in the multinational project found that some biodegradable plastics can also fragment into microplastics. While their environmental behaviour differs from conventional plastics, fragmentation does not necessarily mean complete disappearance or mineralisation.
A Global Environmental Concern
Although the latest field research focused on European agricultural land, researchers say the underlying mechanism is relevant to soils and ecosystems more broadly.
Microplastics can travel between environmental compartments, potentially moving from agricultural soil into water systems, plants, animals and food webs.
A recent review also emphasised that the combination of chemical contaminants and microbial communities on microplastic surfaces can create risks that are difficult to assess when each pollutant is considered separately.
Need for Better Soil Monitoring
Researchers are calling for stronger monitoring of plastic contamination in agricultural soils and greater attention to the combined effects of plastics, pesticides, metals and microorganisms.
The findings suggest that plastic pollution should increasingly be viewed as part of a broader soil-degradation problem, rather than simply as visible waste.