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Life cycle assessment of biodegradable mulch films in strawberry production under alternative end-of-life scenarios.
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Researchers compared plastic mulch films used to cover strawberry fields, including biodegradable options versus traditional plastic that ends up in landfills. Letting biodegradable films break down right in the soil created the least environmental harm overall, cutting pollution and fossil fuel use compared to landfilling regular plastic. This matters because it points toward farming methods that could reduce plastic waste buildup in soil, potentially lowering the microplastic contamination that ends up in our food and water.
Biodegradable mulch films (BDMs) can reduce agricultural plastic waste, but their environmental benefits depend on film composition, material properties, and end-of-life (EoL) management. This study conducted a cradle-to-grave life cycle assessment of poly(butylene adipate-co-terephthalate)/poly(lactic acid) (PBAT/PLA; PPLA) and poly(butylene adipate-co-terephthalate)/thermoplastic starch (PBAT/TPS; PTPS) mulch films in California strawberry production. Three BDM EoL scenarios were evaluated: soil biodegradation (SB), composting (CP), and anaerobic digestion (AD), with landfilled polyethylene mulch film (PEM-LF) as baseline. CP and AD were modeled as complementary routes for the recoverable film fraction. BDM scenarios reduced cradle-to-grave impacts by 7.50-9.02% relative to PEM-LF per functional unit, increasing to 12.32-18.21% on an equal areal-weight basis, through reductions in fossil fuel depletion, eutrophication, and ecotoxicity. PEM-LF performed worst because PEM manufacturing advantages were outweighed by LF ecotoxicity and eutrophication burdens. SB provided the greatest benefit by avoiding waste collection and disposal and crediting biomass formation as soil amendment. AD also performed favorably through biogas energy recovery, especially PTPS-AD, which was comparable to SB. CP was the least favorable BDM EoL strategy but remained better than PEM-LF. This study identified fossil-derived polyester content as the main target for reducing BDM manufacturing impacts, as PBAT contributed >90% of PPLA impacts and 68-96% in PTPS, including about 93% of global warming potential in both. Sensitivity analysis showed that lower fossil-derived polyester content, greater AD biomethane potential, shorter EoL transport distances, and greater SB biodegradation improved BDM performance. This study informs sustainable mulch use and waste management decisions by growers, policymakers, and waste managers.
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Impact of traditional and biodegradable mulching films on plant performance and substrate microbial communities in a small-scale strawberry cultivation
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Researchers compared traditional plastic mulch (the plastic sheeting farmers use to cover soil) with newer biodegradable versions to see how they affect strawberry plants and the helpful microbes living in the soil. This matters because regular plastic mulch breaks down into microplastics that can build up in soil and potentially make their way into our food, so finding a mulch that grows strawberries just as well without leaving lasting plastic waste behind could mean cleaner farmland and fewer microplastics in the food we eat.
Life cycle assessment of different strawberry production methods in Germany with a particular focus on plastic emissions
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Researchers conducted a life cycle assessment comparing different strawberry farming methods in Germany, specifically examining the environmental impact of using plastic mulches, tunnels, and covers. They found that while plasticulture improved yields and reduced some environmental impacts per kilogram of fruit, the accidental release of plastic fragments into the soil added a previously unaccounted-for pollution burden. The study demonstrates that including plastic emissions in agricultural environmental assessments can meaningfully change the overall sustainability picture.
Environmental fate and effects of mulch films on agricultural soil: A systematic review from application to residual impact
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This systematic review traces the full lifecycle of plastic mulch films used in farming, from application to breakdown in soil. While these films boost crop yields, they leave behind persistent residues that fragment into microplastics, potentially contaminating soil and groundwater. The review highlights the need for biodegradable alternatives to reduce long-term microplastic accumulation in agricultural land.
Environmental fate and effects of mulch films on agricultural soil: A systematic review from application to residual impact
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This systematic review examines how plastic mulch films used in agriculture break down over time and release microplastics into farm soil. The films improve crop growth but create lasting environmental damage as plastic fragments accumulate and alter soil properties. The findings underscore the importance of developing truly biodegradable alternatives to protect farmland from microplastic pollution.
iMulch: an investigation of the influence of polymers on a terrestrial ecosystem using the example of mulch films used in agriculture
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This research project studied how plastic mulch films used in farming break down into microplastics in soil, comparing conventional polyethylene films with biodegradable alternatives. The findings show that both types of mulch release microplastic particles into agricultural soil, though they behave differently in the environment, raising questions about the true sustainability of biodegradable farm plastics.
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