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A critical review of biodegradable plastic mulch films in agriculture: Definitions, scientific background and potential impacts
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"Biodegradable" plastic mulch films used by farmers are marketed as a green alternative to regular plastic sheeting, since they're meant to break down in soil instead of being removed and thrown away, but this review of existing research finds that they may not fully break down as promised, potentially leaving behind tiny plastic fragments and chemical additives in farmland soil. Because these residues could work their way into crops, water, and eventually our food supply, scientists say we still don't know enough about their long-term safety, and more real-world testing is needed before these products can be confidently called eco-friendly.
Biodegradable plastic mulches (BDMs) can offer an eco-sustainable alternative to conventional polyethene (PE) mulch films in agriculture. While PE films must be removed after use, BDMs are tilled into the soil, where they are expected to biodegrade. However, their long-term impacts on the soil ecosystem (functions, processes, and microbial communities) remain unclear. This review critically analyses evidence about the potential of BDMs as a possible eco-friendly alternative to traditional PE mulches. It updates the available literature on the possible fate and impacts of BDMs on agriculture ecosystems, pinpointing crucial aspects that deserve further investigation. The combined findings indicated that BDM incorporation into the soil could stimulate microbial activity that may ultimately affect soil organic matter dynamics. However, using BDMs should be linked to the risks of incomplete biodegradation by releasing residual bio-microplastics, bio-nanoparticles and additives. We here highlighted gaps in knowledge (i.e. impact on soil ecology and the risk of toxicity) and the need for long-term studies in natural environmental conditions as well as field experiments to evaluate the actual impact of BDMs on soil health and agroecosystem sustainability. Moreover, there still needs to be more clarity of standards covering the conditions under which the biodegradable plastic mulch films biodegrade to ensure safe end-of-life.
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DATASET. Bioplastics in agricultural soils: Biodegradability, analytical techniques, and soil microbial impact
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"Biodegradable" plastic mulches used in farming are often assumed to be a safe, eco-friendly alternative to regular plastic—but this review of existing research finds that current testing methods may overestimate how completely these materials actually break down in soil. That means tiny plastic fragments and leftover residues could be building up in farmland over repeated growing seasons, which matters because these particles can end up in the food we grow and eventually in our bodies, and we still don't fully understand the long-term risks.
DATASET. Bioplastics in agricultural soils: Biodegradability, analytical techniques, and soil microbial impact
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"Biodegradable" plastic used in farming (like mulch films) doesn't always break down as completely as advertised—this review of existing research finds that current testing methods often miss leftover plastic fragments and residues that can linger in soil for years. Since these tiny plastic bits could work their way into crops and eventually our food, the researchers say we need better long-term testing before assuming these "eco-friendly" plastics are truly safe for farmland.
Are mulch biofilms used in agriculture an environmentally friendly solution? - An insight into their biodegradability and ecotoxicity using key organisms in soil ecosystems
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Researchers assessed the biodegradation and ecotoxicity of a commercial biodegradable mulch biofilm in soil systems. The study found that while marketed as environmentally friendly alternatives to conventional plastic mulch, biodegradable films did not fully degrade under natural soil conditions as certification standards would predict. The results suggest that more rigorous testing under realistic field conditions is needed before assuming these products are safe for soil ecosystems.
[Application and Environmental Risks of Biodegradable Films].
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Biodegradable plastic films are being used more often in farming to replace regular plastic and cut down on pollution, and they even help crops grow better by improving soil conditions. But as these films break down, they can release tiny plastic particles and chemical additives into the soil, which may harm soil organisms and crops—and could potentially make their way into our food supply. This review pulls together existing research on the topic and calls for more studies to better understand and manage these risks before biodegradable films become widespread.
Are biodegradable mulch films a sustainable solution to microplastic mulch film pollution? A biogeochemical perspective
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This review asks whether biodegradable mulch films are truly a sustainable alternative to conventional plastic films used in agriculture. Researchers found that biodegradable microplastics may actually accumulate more readily in soil than traditional microplastics because they require specific conditions to fully break down. The study warns that biodegradable films could alter soil carbon and nitrogen cycling, microbial communities, and greenhouse gas emissions in ways not yet fully understood.
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