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Long-Term Application of Organic Compost is the Primary Contributor to Microplastic Pollution of Soil in a Wheat–Maize Rotation
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Impact of Organic Amendments on Microplastics and Heavy Metal Accumulation in Agricultural Soils under Wheat–Maize Rotation
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A two-year field trial under wheat-maize rotation found that all five types of organic amendments—including compost and farmyard manure—significantly increased microplastic contamination in soil layers, with concentrations reaching up to 4,126 microplastic items per kilogram. The findings are important because organic fertilizers are widely promoted as sustainable agricultural inputs, yet this study shows they can be a major vector introducing microplastics into food-producing soils.
Long-term application of organic compost is the primary contributor to microplastic pollution of soils in a wheat–maize rotation
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Researchers found that 11 years of organic compost application was the primary contributor to microplastic accumulation in wheat-maize rotation soils, with pig and cow manure composts introducing significant quantities of microplastic particles into agricultural fields.
Microplastics in Agricultural Soils
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Researchers reviewed what is known about microplastic contamination in agricultural soils, noting that despite hundreds of millions of tonnes of plastic entering the environment annually, very little is understood about how microplastics persist, migrate, and affect soil ecosystems. This knowledge gap is concerning given that contaminated soil directly affects food crops consumed by humans.
Impact of Microplastic Contamination in Compost on Wheat Crop Growth: A Study of Bread and Durum Wheat Varieties
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Researchers inventoried microplastic content in commercially available compost and then exposed bread and durum wheat varieties to MP-contaminated growing conditions, measuring the effects on crop growth and raising concerns about microplastic transfer into the human food supply via agriculture.
Microplastic accumulation in agricultural soils – Impacts on crop microbiomes and soil health
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Researchers review how microplastics from mulch films, sewage sludge, and wastewater accumulate in agricultural soils, disrupting microbial communities, reducing enzyme activity essential for nutrient cycling, and accumulating in crop tissues, raising food safety concerns and highlighting the need for biodegradable alternatives and better wastewater treatment.
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