When Microplastics Meet Agrichemicals

The intersection of microplastics and agrichemicals—particularly pesticides—has gained urgency in the past year as accumulating research reveals synergistic effects that amplify environmental and health risks beyond what either pollutant causes alone.

In February 2025, a comprehensive literature review of over 90 studies documented how microplastics increase pesticide bioavailability, persistence, and toxicity in agricultural settings. These interactions occur primarily through adsorption, where pesticides bind to microplastic surfaces, altering their environmental behavior, extending their lifespan in soil, and heightening uptake by plants, microbes, and nontarget organisms. The review highlighted threats to soil health, biodiversity, and sustained agricultural productivity, as microplastics exacerbate pesticide exposure to beneficial species while potentially reducing the efficacy of pest control.

This builds on earlier concerns about intentional microplastic use in agrichemicals. Plastic coatings on controlled-release fertilizers and some pesticide formulations deliberately introduce microplastics into soils. Studies show these particles not only persist but can make active ingredients more toxic—for instance, encapsulation in nanoplastics has rendered common insecticides far more harmful to aquatic life, and microplastics have increased bioaccumulation of pesticides like chlorpyrifos in crop roots such as radishes.

Real-world impacts hit hardest in agricultural ecosystems and downstream. Soil microbes suffer disrupted nitrogen cycling, with combined exposures altering bacterial communities, enzymatic activity, and nutrient processes essential for fertility. Non-target organisms—from pollinators to aquatic species—face elevated risks through enhanced toxicity and bioaccumulation. Farmers contend with potential long-term declines in soil productivity and food safety concerns, as microplastics enter crops and the food chain. Human exposure occurs via contaminated produce, water, and dust, with adsorbed toxins potentially contributing to broader health issues like endocrine disruption.

The topic's timeliness stems from the rapid growth in relevant peer-reviewed evidence since 2024-2025, including specific studies on microbial effects, pesticide degradation changes, and tripartite interactions involving veterinary medicines. Global pesticide use continues rising—reaching 3.7 million tons of active ingredients in 2022—and agricultural plastics remain widespread despite known issues. Regulatory scrutiny is emerging, but deliberate additions via coated products continue, underscoring preventable yet escalating contamination in farmlands worldwide.