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Biochar Mitigates the Detrimental Effects of Combined Drought and Microplastic Stress on Alfalfa by Modulating Physiological and Molecular Responses
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Drought and microplastic pollution in soil are a one-two punch that stunts crop growth, but this study found that adding biochar (a charcoal-like soil additive made from organic waste) helped alfalfa plants recover, boosting their growth by nearly 40% by improving nutrient uptake and reducing plant stress damage. This matters because as microplastics increasingly contaminate farmland and droughts become more common with climate change, biochar could be a cheap, eco-friendly way to protect crop yields—which ultimately affects food supply and security for everyone.
The terrestrial ecosystem is simultaneously facing multiple stresses, such as drought and microplastics (MPs), which are negatively affecting humans, crop productivity, and environmental quality. Biochar (BC) is a widely used soil amendment that enhances crop productivity and mitigates stress. In this study, we examined how BC alleviates the harmful effects of combined drought and MPs on alfalfa (Medicago sativa L.) plants. The study contained seven treatments: control, DS (60% water holding capacity: WHC), MPs (1%), DS + MPs, DS + BC (2%), MPs + BC (2%), and DS + MPs + BC (2%). Both individual stresses, and particularly their co-exposure, markedly reduced alfalfa growth and biomass yield (44.99%) by decreasing root growth, chlorophyll contents, relative water contents (RWC), and soil nutrient availability, and by increasing malondialdehyde (MDA) and hydrogen peroxide (H₂O₂) production. Biochar effectively mitigated the adverse effects of the individual stresses and their combined exposure. Notably, BC under co-exposure to DS and MPs enhanced biomass yield (39.38%) by increasing photosynthetic pigments, leaf photosynthetic rate (Pn: 21.41%), transpiration rate (Tr: 39.28%), stomatal conductance (gs: 41.10%), and soil nutrient availability (N: 37.17%, P: 34.42%, and K: 34.89%), while decreasing MDA (51.04%) and H₂O₂ (38.84%) production. Biochar also reduced H₂O₂ in alfalfa plants by increasing antioxidant activities (APX: 34.80%, CAT: 55.97%, POD: 59.82%, and SOD: 31.17%) and by increasing the expression of antioxidant genes such as MtAPX (24.27%), MtCAT (17.72%), MtPOD (12.80%), and MtSOD (27.46%). Collectively, these findings suggest that BC mitigates the toxic impacts of combined DS and MPs by modulating antioxidant activities, gene expression, and nutrient availability. Thus, BC appears to be an effective and eco-friendly soil amendment for enhancing crop productivity under combined abiotic stresses. These findings lay the foundation for developing sustainable solutions to counteract multi-stress conditions and enhance crop productivity.
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This study tested whether adding biochar to microplastic-contaminated soil could improve soil quality and crop performance. Researchers found that biochar application helped offset some of the negative effects of microplastics on soil properties and boosted barley yields even under drought conditions. The results suggest biochar could be a practical tool for managing farmland affected by plastic pollution.
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This study found that adding biochar (a charcoal-like soil additive made from organic waste) to soil contaminated with microplastics helped chrysanthemum plants grow better and boosted the health of beneficial soil bacteria. This matters because microplastics are increasingly polluting farmland soil, and finding low-cost ways to counteract their harmful effects could help protect the food crops we eventually eat and the soil ecosystems that support them.
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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.
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Plastic pollution in farm soil is a growing problem, but this study found that adding biochar (charcoal made from plant waste) or organic materials like compost and manure can help soils recover. These additions restored nutrients, improved soil structure, and boosted helpful microbes, offering a practical way to protect the soil that grows our food.
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This analysis combined results from 59 studies on soil and plants exposed to microplastics or nanoplastics. Adding biochar to soil was linked to healthier plant growth, less plant damage, and lower microplastic buildup in plants, though the effects varied depending on conditions and were weaker in more realistic, complex settings than in controlled experiments.
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