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Interactive effects of combined manganese and microplastic pollution on soybean growth
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Researchers found that combined polyethylene microplastic and manganese pollution in soil significantly reduced soil pH and inhibited soybean growth in pot experiments, with the two stressors showing interactive effects on soil organic matter and plant development outcomes.
Soil microplastics (MPs) and heavy metals pose a threat to agricultural production. Excessive manganese (Mn) can be toxic to plants. The impacts of combined MP and Mn pollution in soil on plant growth are poorly understood. This pot experiment systematically investigated the effects of single or combined pollution by polyethylene microplastics (PE-MPs) at different concentrations (0%, 0.50%, and 1.5%) and Mn (MnSO4, 0%, 0.25%, and 0.50%) on soybean growth. The addition of Mn + PE-MPs significantly reduced soil pH; PE-MPs increased soil organic matter (OM), while Mn (0.25%) + PE-MPs significantly decreased soil OM. Both single and combined additions of Mn and PE-MPs significantly reduced soil available nitrogen and available phosphorus, but increased soil available potassium. Polyethylene microplastics decreased the number of soybean root tips, whereas Mn (0.25%) resulted in a significant increase. Soybean biomass was highest under the Mn (0.25%) + PE-MPs (0.50%) treatment. PE-MPs significantly increased the peroxidase, catalase, and superoxide dismutase activities in soybeans, while Mn (0.25%) significantly reduced their activities. The addition of low concentrations of Mn alleviated the PE-MP stress on soybeans and exerted a detoxifying effect. These findings provide scientific support for the safe production of soybeans.
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This study examined how polyethylene microplastics interact with heavy metals in soil and found that microplastics significantly reduced plant growth while altering soil enzyme activity and microbial communities. The combination of microplastics and heavy metals disrupted nutrient cycling in the soil in ways that were different from either pollutant alone. These findings suggest that microplastic contamination in agricultural soil could affect crop nutrition and food production.
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