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The Accumulation of Microplastics in Agricultural Soils: Ecological Consequences and Innovative Bioremediation Strategies
Summary
Tiny plastic bits from mulch films and sewage sludge are building up in farm soil, making it hold less water and disrupting the microbes that help crops grow — which matters because that's the soil growing the food we eat. The good news: researchers found that combining earthworms with plastic-eating microbes could clear out up to 60% of these microplastics in just two growing seasons, offering a promising, low-tech way to clean up farmland before contamination gets worse.
Agricultural soils are increasingly emerging as a global "sink" for microplastic (MP) particles, originating from plastic mulching, sewage sludge, and atmospheric deposition. This study investigates the profound impacts of MP accumulation on soil physico-chemical properties, microbial communities, and crop productivity. The primary objective is to evaluate the extent of MP contamination and develop a scalable bioremediation framework. Utilizing a multi-year field experiment (2024–2026) and laboratory analysis, we demonstrate that MP presence reduces soil water-holding capacity by 15–22% and significantly alters microbial metabolic pathways. We propose an integrated "Bioremediation System" utilizing Eisenia fetida (earthworms) in combination with a specialized microbial consortium capable of degrading polyethylene and polypropylene particles. Our results indicate a potential reduction in MP concentration by up to 60% within two growing seasons. These findings provide a scientific basis for sustainable soil management practices in the face of escalating plastic pollution.