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The effects of different types microplastics on soil properties and the biochemistry of Chinese cabbage under different dosages and exposure times
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Microplastics from packaging and other plastic waste are building up in farm soils, and this study found that they can change soil quality and stress out crops like Chinese cabbage, altering nutrients, water content, and the plant's natural defense systems, especially at high concentrations. While this research looked at soil and plant health rather than testing the cabbage for human safety, it's a reminder that the plastic pollution we create doesn't just disappear, it may be quietly affecting the soil that grows our food.
The impact of microplastics (MP) on agricultural ecosystems has drawn widespread attention around the world. This study aims to evaluate the impacts of MP with different types, doses and exposure times on the soil-plant system. A pot experiment was conducted to explore the impacts of four common MP, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polyolefin resin (PO), at different dosages (0.1 and 20 g MP/kg soil) and exposure times (10 d, 20 d, and 30 d) on soil properties and the physiology and biochemistry of Chinese cabbage (Brassica chinensis L.). The results demonstrated the following: (1) In terms of soil properties, with the increase of exposure time, high-concentration MP led to an elevation of soil pH, among which PE had the most significant impact. High-concentration PVC remarkably reduced water content, nitrate nitrogen content, and catalase (CAT) activity, increased available phosphorus content and the quantity of microorganisms. All four types of MP were capable of decreasing soil organic matter, ammonium nitrogen content, and sucrase activity. At low concentrations, they significantly reduced soil urease activity. (2) Regarding Chinese cabbage, MP could reduce its water content. 0.1% PE significantly inhibited the plant height, and promoted root length. Different concentrations of MP could significantly enhance the chlorophyll content. High-concentration MP increased the peroxidase activity of Chinese cabbage while decreasing the superoxide dismutase and CAT activity. This study indicates that the risks of MP to the soil-plant system are dependent on type, dosages, and exposure times.
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Impact of microplastics on soil (physical and chemical) properties, soil biological properties/soil biota, and response of plants to it: a review
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This comprehensive review synthesizes evidence that microplastics alter soil physical structure, chemical properties including pH and nutrient cycling, and the communities of earthworms, collembolans, and microbes that maintain soil health, with cascading effects on plant growth and agricultural productivity. Because healthy soils underpin global food production, microplastic-driven degradation of soil ecosystems represents a long-term threat to food security and introduces a terrestrial route by which plastic contaminants accumulate in crops consumed by humans.
Influences of microplastics alone and co-contaminated with cadmium on physiological responses of Chinese cabbage ( Brassica campestris L.), rhizosphere microbes and soil properties in soil
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Scientists tested how plastic pollution (microplastics) and cadmium, a toxic heavy metal, affect Chinese cabbage grown in contaminated soil, both matter because they can build up in crops we eat and impact human health. Surprisingly, small-to-moderate amounts of microplastics actually helped protect the cabbage from cadmium's harmful effects by changing soil chemistry and boosting helpful soil microbes, though this doesn't mean microplastic pollution is safe overall. This research shows the relationship between plastic pollution and toxic metals in soil is complicated, and more study is needed before we underst
Effects of Microplastics on Soil and on Lettuce and Tomato, Depending on Type, Size, and Concentration
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An 8-week pot experiment showed that microplastic type, size, and concentration produce species-specific, dose-dependent responses in lettuce and tomato, with tomato reaching 100% mortality at 10% concentration primarily because microplastics disrupted soil water-holding capacity rather than acting as direct chemical toxicants. This physical disruption mechanism means even low microplastic levels in agricultural soils may progressively degrade water availability for crops and threaten food security.
Single and combined effects of secondary polyethylene microplastic on the growth of Pak choi and the soil microbiome composition
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Researchers found that secondary polyethylene microplastics (aged via weathering and mechanical stress) significantly inhibited Pak choi growth, caused oxidative damage to plant cells, and altered soil microbial composition, while showing antagonistic combined effects with DDT and naphthalene due to MP adsorption of co-contaminants. Agriculturally realistic aged PE microplastics harm food crops and disrupt the soil microbiome, with soil chemical properties changing in ways that could affect long-term agricultural productivity.
Effects of Conventional and Biodegradable Microplastics on Soil Physicochemical Properties and Microorganisms
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A four-month soil incubation experiment compared conventional polyethylene (PE) and biodegradable polylactic acid (PLA) microplastics, finding both alter soil organic carbon, nitrogen availability, enzyme activity, and microbial community composition — with PLA causing distinct effects due to its degradability. The finding that biodegradable plastics still significantly disrupt soil microbiology challenges assumptions about their environmental safety and suggests replacing conventional plastics with PLA does not eliminate ecological harm.
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