We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Designed to Guide, Destined to Pollute: The Overlooked Microplastic Source in Agricultural Mulch Films
AI summary Read the abstract
Farmers often use plastic mulch (woven sheets with green stripes) to help crops grow, but a 12-year study found this practice leaves behind thousands of microplastic particles per kilogram of soil—and surprisingly, the thin green marking lines break down much faster than the black plastic, making them the biggest source of contamination despite being a tiny fraction of the material. The study also found that a plasticizer chemical (DEHP), linked to hormone disruption in humans, leached out of the plastic into the soil over time. Since these microplastics and chemicals can end up in the food we grow, the findings suggest simple design changes—
Mulching is a common agricultural practice that improves crop quality and yield. However, it also contributes to soil contamination with microplastics, raising environmental concerns. To develop sustainable agricultural policies, quantifying microplastic pollution in soils caused by mulching is essential. Despite their design for perennial use and widespread application, woven polypropylene films have not yet been investigated as a potential microplastic source. Here, we examined microplastic contamination in an agricultural field mulched for twelve years with a black woven polypropylene film with green marking lines. About 4000±1700 polypropylene particles per kilogram of dry soil were detected, with mulch film fragments making up ~60% of the total microplastic load. Although the green marking lines only constitute 2.5 wt% of the applied mulch film, they account for the majority (62%) of these fragments. We show that the significantly faster degradation of the marking lines is caused by enhanced photooxidation due to covalent grafting of the green dye using maleic anhydride and a lack of efficient UV protection. In contrast, the black woven fabric is protected against photooxidation by the addition of carbon black, causing less microplastic contamination (38%). In the pristine films, the environmentally problematic plasticizer DEHP (~0.1 mol%) was identified. However, after twelve years in the field, the DEHP content fell below the detection limit, indicating leaching. Our work highlights the marking lines as a major source of microplastic pollution in the investigated field, which can be easily avoided by alternative film design. Our results further urge a critical reassessment of problematic additives in mulch films.
More Papers Like This
Impact of plastic mulching as a major source of microplastics in agroecosystems
AI summary Read the abstract
This review examines how plastic mulch films used in agriculture break down into microplastics over time, making farmland a major source of soil microplastic pollution. The accumulated microplastics can alter soil properties, affect plant growth, and be taken up by crops that humans eat. The study highlights the need for better end-of-life management of agricultural plastics and more research on how farm-sourced microplastics enter the food chain.
[Occurrence and Characteristics of Macro/Micro-plastics and Phthalates in Soils Under Different Plastic Film Mulching].
AI summary Read the abstract
Researchers assessed residual characteristics of macroplastics, microplastics, and phthalate plasticizers in agricultural soils under different plastic film mulching treatments over a three-year field experiment, comparing traditional PE film with three types of biodegradable mulch and a no-mulch control. The study examined whether biodegradable film substitution effectively reduces soil plastic and PAE residual pollution.
Plastic mulching, and occurrence, incorporation, degradation, and impacts of polyethylene microplastics in agroecosystems
AI summary Read the abstract
This review examines how plastic mulch films used in agriculture break down into polyethylene microplastics and what happens to them in farm ecosystems. Researchers describe how microorganisms colonize these particles and can eventually break down the plastic molecules, but also how the microplastics alter soil microbial communities and nutrient cycling. The study highlights plastic mulching as a major source of microplastic contamination in agricultural soils worldwide.
Plasticulture: Product- and polymer-specific weathering shapes microplastic accumulation and composition in agricultural soils
AI summary Read the abstract
Farms that use plastic mulch films (and especially thin ones, plus plastic support threads) build up far more microplastic pollution in their soil over time, fields mulched for 20+ years had over 5 times more microplastic particles than unmulched fields. Since these plastics can break down further and potentially move into the crops grown in that soil, this matters for anyone eating food grown using conventional plastic mulching, and suggests farms should consider thicker films or alternatives to cut down on contamination.
Plastic Mulch Films in Agriculture: Their Use, Environmental Problems, Recycling and Alternatives
AI summary Read the abstract
This review examines how plastic mulch films used in farming break down into microplastics and nanoplastics that contaminate soil, harm soil organisms, and can enter the human body through the food chain. While developed countries are making progress with recycling and biodegradable alternatives, the health effects of nanoplastics from agricultural plastic remain largely unknown. Better collection, recycling, and alternative materials are needed to reduce this growing source of plastic pollution.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.