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Application of Plastics in Promotion of Organic Farming
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This review examines the application of plastics in organic farming, contrasting conventional polymers such as polyethylene and polypropylene — which persist in soil and break down into micro- and nanoplastics — with biodegradable alternatives designed to be metabolised by soil microbes. The authors highlight that biodegradability depends on both polymer physicochemical properties and environmental conditions, underscoring the trade-offs involved in agricultural plastic choices.
Plastic is a broad term for a material based on one or more organic polymers with added substances (additives) to achieve desired properties, such as flame retardants, antistatics, coloring agents, stabilizers, reinforcing materials, UV-adsorbents, and plasticizers. Conventional polymers like polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) are environmentally persistent due to their chemically stable polymer backbones. Agricultural plastics made from these polymers can break down into micro- and nanoplastics (MNP), accumulating in soils, being taken up by organisms, or moving into surrounding environments. Biodegradable polymers, on the other hand, are designed to be metabolized by microbes, converting the polymer carbon into CO2 and microbial biomass in oxygen-rich conditions. The biodegradability of a polymer depends on its physicochemical properties and the environmental conditions where it degrades.
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Biodegradable Polyesters and Low Molecular Weight Polyethylene in Soil: Interrelations of Material Properties, Soil Organic Matter Substances, and Microbial Community
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Researchers examined how biodegradable polyesters and low molecular weight polyethylene behave in soil environments, investigating their interactions with soil organic matter and microbial communities over time. They found that both biodegradable and conventional polymer microplastics alter soil microbial community composition and interact with organic matter fractions, with biodegradable plastics showing distinct but not necessarily more benign effects than conventional plastics.
The role of biodegradable plastic mulches in soil organic carbon cycling
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This review examines the role of biodegradable plastic mulches in soil organic carbon cycling as an alternative to conventional polyethylene mulches, which shed microplastics into agricultural soils. Biodegradable mulches offer potential environmental benefits but their long-term soil impacts are still being studied.
Degradable versus inert microplastics: Effects on soil organic carbon persistence via microbial drivers in an agroecosystem
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Researchers found that not all plastic pollution in soil acts the same way: regular plastic (polyethylene) seemed to break down soil carbon and reduce its ability to stay locked away, while "biodegradable" plastic (PLA) actually helped soil microbes build more stable carbon storage. This matters because healthy farm soil that holds onto carbon helps fight climate change, so the type of plastic mulch or waste farmers use could have real consequences beyond just pollution—it may affect how much carbon farmland can pull out of the atmosphere long-term.
A Comprehensive Review of Polyethylene and Biodegradable Plastic Mulch Films: Impacts on Soil Health and Plant Growth
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This comprehensive review compares polyethylene and biodegradable plastic mulch films used in agriculture, examining their effects on soil properties, microplastic accumulation, plant growth, and the actual biodegradation performance of certified biodegradable alternatives under field conditions.
Environmental impacts and challenges of biodegradable plastic mulches in agricultural soils
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This review paper summarizes existing research comparing plastic farm mulches, which break down into microplastics over time, with biodegradable alternatives. It examines the benefits, costs, and environmental impacts of biodegradable mulches, noting that challenges remain, including high production costs and limited manufacturing capacity, before wider use is possible.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.