Summary
This 2022 field investigation assessed the long-term degradation of commercially marketed biodegradable plastic mulch films under realistic agricultural conditions. The authors report that incomplete degradation of these products may fragment into persistent microplastics that pose underappreciated risks to soil biological function and plant productivity. The findings suggest that current assumptions about the environmental benignity of biodegradable mulch require longer-term monitoring and broader field validation to establish the full scope of soil health impacts.
Regional applicability
Biodegradable mulch adoption in UK horticulture (particularly soft fruit and vegetable production) is growing; this review's conclusions on residual microplastics and soil health impacts are directly applicable to UK agricultural policy and practice, particularly regarding regulation of plastic film products and soil quality standards.
Key measures
Degradation rates of biodegradable mulch films; microplastic fragment accumulation and persistence in soil; soil biological indicators; plant growth and health metrics
Outcomes reported
The study examined the long-term degradation behaviour of biodegradable plastic mulch films under field conditions and assessed the persistence of microplastic fragments in soil. The authors quantified the extent of incomplete degradation and evaluated potential impacts on soil biological function and plant health.
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