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The pathology of hype, hyperbole and publication bias is creating an unwarranted concern towards biodegradable mulch films
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This paper challenges the growing alarm around biodegradable mulch films by critically analyzing studies that report negative effects on soil. The authors argue that many of those studies used unrealistic experimental conditions, such as adding virgin plastic pieces at concentrations hundreds of times higher than actual field use. The study calls for more balanced research and cautions against letting publication bias drive premature conclusions about biodegradable agricultural films.
The idea that it is a risk to promote biodegradable mulch films on a large scale is becoming established at academic level based on a series of articles similar in approach and conclusions. However, a critical analysis shows that the results do not justify the alarmist tones. The negative effects of hand-cut pieces of virgin material added in pots at concentrations up to 714 times the application doses are ascribed to the "accumulation" and "contamination" of "residues" and "debris" of biodegradable plastics. Yet, no accumulation and no contamination of biodegradable microplastics has actually been shown. No Predicted Environmental Concentration was established, thus the use of the term risk is inappropriate. The hypothesis of transient phytotoxicity of organic matter under decomposition i.e., an artificial outcome of the experimental scheme used, was not considered. A scrupulous approach to terminology is very important for the quality of communication and for the development of innovations. Scientific communication is a delicate process in which and to avoid hyperbole, there must be strict logical and lexical consistency between results and conclusions. Guidelines on the communication of the results of studies on biodegradable mulch must be developed to avoid the spread of unjustified concerns.
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Comments to "Degli-Innocenti, F. The pathology of hype, hyperbole and publication bias is creating an unwarranted concern towards biodegradable mulch films" [J. Hazard. Mater. 463 (2024) 132923].
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This commentary challenged industry claims that biodegradable mulch films are environmentally friendly, presenting evidence that they degrade incompletely in agricultural soils, leaving behind microplastic residues that can persist in the soil and affect soil health similarly to conventional plastics.
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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.
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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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"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.
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This study examined plastic mulch use in agriculture, arguing that short-term crop benefits come with long-term costs as mulch fragments accumulate in soil as microplastics and disrupt soil structure, biology, and water dynamics.
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