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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.
Biobased and biodegradable plastic mulch films (aka, mulch biofilm) have emerged as a sustainable alternative to conventional plastic mulch films in agriculture, promising to reduce soil contamination with plastic residues through in situ biodegradation. However, current standards certifying biodegradable plastics cannot predict biodegradability in natural settings. The scarce studies considering the possible biodegradation and ecotoxicity of mulch biofilms in soil systems question the environmental friendliness of these alternative options. This study assessed the biodegradation of a commercially available mulch biofilm by the soil-dwelling fungus Penicillium brevicompactum (in solid culture media and soil for 15 and 28 days, respectively), and the ecotoxicological effects of mulch biofilm microplastics on the earthworm Eisenia andrei (pristine or UV-weathered, at 0.125-0.250-0.500 g/kg). Results (from microplastics' mass loss, microscopy, and FTIR spectroscopy) suggest that the presence of P. brevicompactum promotes mulch biofilm's biodegradation. Exposure to environmental concentrations of pristine biofilm microplastics (and its ingestion) increased earthworms' sensitivity to touch, induced physiological alterations, decreased energy reserves, and decreased their reproduction (>30%). Conversely, exposure to weathered biofilm microplastics slightly increased earthworms' sensitivity, as well as carbohydrate reserves,without affecting their reproduction. The tested mulch biofilm seems to be, at first sight, an environmentally friendly alternative as it presented susceptibility for biodegradation by a widespread fungus, and the absence of ecotoxicological chronic effects on a key macroinvertebrate species in soil ecosystems when considering environmental relevant concentrations and plastics weathered conditions. Notwithstanding, the obtained results highlight the need to revise current standards, as they often neglect the role of, and their chronic effects on, naturally occurring organisms.
More Papers Like This
Biodegradability and ecotoxicity of a biobased and biodegradable mulch film using key organisms in soil ecosystems
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Researchers tested whether the soil fungus Penicillium brevicompactum could accelerate biodegradation of a commercial biobased mulch film in culture media and agricultural soil over 15-28 days, and assessed ecotoxicological effects of pristine and UV-C weathered microplastics from the same material on earthworms (Eisenia andrei) at environmentally relevant concentrations. Results indicated fungal-mediated acceleration of biodegradation, while earthworm exposures revealed adverse effects at tested concentrations, challenging assumptions that biodegradable certification ensures environmental safety.
It is still too early to promote biodegradable mulch film on a large scale: A bibliometric analysis
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Researchers conducted a bibliometric analysis of studies on biodegradable mulch film as an alternative to conventional plastic mulch in agriculture. The study found that despite growing research interest, significant knowledge gaps remain regarding biodegradation rates in real field conditions and potential ecotoxicity of degradation byproducts. The analysis suggests it is premature to promote large-scale adoption of biodegradable mulch film without further evidence of its environmental safety.
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 Mulch Films: Impacts on Soil Microbial Communities and Ecosystem Functions
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This review examines how biodegradable plastic mulch films affect soil microbial communities and ecosystem functions compared to conventional polyethylene mulches. Researchers found that while biodegradable films avoid the problem of permanent plastic accumulation, their breakdown products can still alter soil microbiomes and carbon cycling in ways that are not yet fully understood. The study highlights the need for long-term field research to determine whether biodegradable mulches are truly a sustainable alternative for agriculture.
Biodegradable mulch films exhibit slower-than-expected degradation with negligible effects on soil microbial communities
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Researchers ran a year-long field trial with seven biodegradable plastic mulch films in the UK, finding that none fragmented into soil microplastics as expected and all degraded far more slowly than current industry standards suggest they should. Despite virtually no measurable impact on soil microbial communities, the results challenge the assumption that biodegradable plastics reliably break down under real farming conditions.
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