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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.
The adoption of biodegradable plastic mulch films (PMFs) has increased as a sustainable alternative to conventional PMFs. However, evidence suggests that current biodegradability standards may not reflect in-field conditions, leading to potential accumulation of biodegradable PMFs in soil with yet undetermined effects on soil microbial communities. We therefore conducted a field experiment to investigate the above and below ground degradation of one conventional and seven biodegradable PMF blends in a temperate climate (UK) over 12 months. We found that PMFs had no effect on soil properties and a negligible effect on microbial community structure. The main factors driving change in relative abundance of bacteria and fungi were exposure time, followed by the potential of meso- and macrofauna interactions. PMFs buried in soil showed no sign of fragmentation, regardless of presence of meso- and macrofauna, which was likely the cause for no overall difference in microplastic concentrations. The slow degradation of all PMFs combined with the lack of physical fragmentation under natural conditions, indicates that degradation is slower than expected according to current biodegradability standards. This highlights the importance of reframing standards by treating degradation as a system property, influenced by a variety of environmental and intrinsic factors.
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Scientists buried and exposed seven types of plastic mulch films (used by farmers to cover soil) for a year in UK fields to see how fast they break down and how many microplastic particles they shed into soil. This matters because as these plastics degrade, they don't just disappear—they fragment into tiny pieces that build up in farmland soil, potentially entering the food we grow and eat, and the study also looked at how this affects soil health and the microbes living there.
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Nordic field studies tracked the in situ degradation of biodegradable plastic mulch films under cold, wet, low-UV conditions, finding that degradation was far slower than under the warm conditions where biodegradable plastics perform as designed, raising concerns about persistence in northern agricultural soils.
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.
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