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The dual role of biochar in modulating microplastic effects on soil nitrogen
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Tiny plastic particles from everyday waste are building up in farm soils, potentially messing with the nitrogen cycle that helps crops grow. This study found that adding biochar (a charcoal-like soil additive made from burned plant material) helped boost nitrogen levels in plastic-contaminated soil, though it also shifted the balance of soil bacteria in ways scientists don't fully understand yet. While this doesn't directly test food safety or human health, it's an early step toward finding ways to protect soil health, and the food grown in it, from the growing problem of plastic pollution.
Microplastics persist in the environment due to their resistance to degradation and pose an increasing concern for terrestrial ecosystems, threatening soil physicochemical properties and nitrogen (N) cycling. Biochar is widely used to improve soil quality and mitigate contamination. However little is known about how biochar modulates microplastic effects on soil N cycling. Therefore, we conducted a soil incubation experiment to investigate the effects of different polyethylene microplastic particle sizes (6.5, 600 and 1700 μm) on soil N dynamics and to evaluate the combined influence of biochar in microplastic-contaminated soils. Although significant differences among individual microplastic-size treatments were observed at some sampling times, no consistent particle-size dependent effect on soil nitrogen pools was observed throughout the incubation period. However, the addition of biochar significantly increased soil total N, nitrate-N, and alkali-hydrolyzable N contents. Microbial community analysis revealed that the 1700 μm polyethylene microplastic combined with biochar resulted in distinct microbial community structures compared with the control treatment, particularly after 45 days of incubation. Microbial community analysis revealed that the combination of polyethylene microplastics and biochar altered the composition of the dominant bacterial genera, with the greatest community shift observed under the 1700 μm microplastic treatment after 45 days of incubation. Overall, both microplastic presence and biochar amendment altered soil microbial community composition. These findings suggest that corn straw biochar may improve soil nitrogen availability under the experimental conditions of this study and provide insight into microbial responses to polyethylene microplastics. Additional studies across different soil types, biochar feedstocks, microplastic polymers, and field conditions are needed to evaluate the broader applicability of these findings.
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Scientists found that adding biochar (a charcoal-like material made from plant waste) to soil contaminated with microplastics helped restore healthy microbial communities and nutrient cycling. The biochar reversed negative effects that microplastics had on soil chemistry, including nitrogen and phosphorus availability. This suggests biochar could be a practical tool for repairing farmland damaged by microplastic pollution.
Microplastics increase nitrogen mobility in soils while biochar regulates NH4+ and NO3- transport: A soil column study
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Tiny plastic particles that build up in farm soil can make it harder for soil to hold onto nitrogen fertilizer, causing more of it to wash away into groundwater, which matters because excess nitrogen runoff can contaminate drinking water sources. The good news: adding biochar (a charcoal-like soil additive made from rice husks) helped soil trap nitrogen even when microplastics were present, suggesting a practical way to protect water quality as plastic pollution in farmland continues to rise.
Biochar-mediated remediation of low-density polyethylene microplastic-polluted soil-plant systems: Role of phosphorus and protist community responses
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Researchers found that adding biochar (a charcoal-like soil additive) to soil contaminated with microplastics helped improve plant growth by restoring phosphorus cycling. The microplastics disrupted soil microbe communities, but biochar treatment shifted these communities in beneficial ways. This suggests biochar could be a practical tool for farming in soils contaminated with plastic pollution.
Biochar as a Climate-Smart Approach for Soil Health Improvement and Nano-/Microplastic Mitigation in Sustainable Agriculture: A Review
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Tiny plastic particles are building up in farm soils, potentially getting absorbed by crops we eat—but this review of existing research suggests that biochar (a charcoal-like material made from organic waste) can act like a sponge to trap these plastics in soil before they reach our food. It also improves soil quality and helps fight climate change, though scientists still need more research to understand its limits, especially in certain soil types.
Biochar relieves the toxic effects of microplastics on the root-rhizosphere soil system by altering root expression profiles and microbial diversity and functions
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Researchers found that adding biochar (a charcoal-like soil amendment) to soil contaminated with polystyrene microplastics helped peanut plants recover by boosting their antioxidant defenses and restoring beneficial soil bacteria. This suggests biochar could be a practical tool for protecting crops in microplastic-contaminated farmland, which matters for food safety and reducing the amount of microplastics that enter the human food chain.
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