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Polyethylene Microplastic-Induced Changes in Soil Properties Mediate Nutrient Accumulation and Growth of Amaranthus tricolor L.
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Scientists found that microplastic pollution in soil can stunt the growth of Amaranth (a leafy green vegetable), reduce its nutrient content, and harm beneficial soil bacteria — even at fairly low plastic concentrations. This matters because as plastic waste keeps building up in farmland, it could quietly shrink harvests and lower the nutritional quality of the vegetables we eat, making microplastic pollution a food security issue, not just an environmental one.
The impact of microplastic pollution on soil functions and the ecological toxicity to crops is a hotspot in agronomy and environmental science. In this study, a pot experiment was conducted to examine the effects of polyethylene microplastics (PE-MPs) at concentrations of 0.25%, 0.5%, 2.5%, and 5% on the growth, physiological indicators, soil physical and chemical properties, and soil bacterial community diversity of Amaranthus tricolor L. The results showed that adding PE-MPs inhibited the growth of A. tricolor L. stems and leaves, and as the dosage increased, the aboveground fresh weight decreased by 13.5% to 60.7%. At the same time, the chlorophyll content in A. tricolor L. leaves decreased, whereas the malondialdehyde (MDA) content increased by up to 11.8%. When the added dosage of PE-MPs was ≥0.5%, soil porosity and available phosphorus (AP) content significantly decreased, resulting in a significant reduction of 22.1% to 31.3% in the phosphorus content of the aboveground parts of A. tricolor L. compared with controls (CK). High-throughput sequencing results indicated that adding PE-MPs could reduce the Shannon index of the soil bacterial community and increase the Simpson index, suggesting a decrease in diversity. The addition of PE-MPs also altered the structure of the soil bacterial community, increasing the relative abundance of the Acidobacteriota, while the abundance of the Planctomycetota significantly decreased. This study provides a numerical and theoretical basis for evaluating the impact of microplastics on vegetable production and soil ecological environment effects.
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Researchers tested how mixed plastic waste — polyethylene and disposable plastic cups — affects the growth of green amaranth plants in Bangladesh. They found that even low doses of plastic contamination inhibited plant growth, with higher doses causing progressively greater stunting, highlighting the threat of soil plastic pollution to agriculture.
Impact of Microplastics on Germination Index and Proline Content of Crop Plants
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Tiny plastic bits from pollution are seeping into farm soil, and this study found they can slow seed sprouting and stunt early growth in crops like peas and amaranth—with peas struggling more than amaranth. Since these crops end up on our plates, this research is an early warning sign that plastic pollution could eventually affect food supply and quality, reinforcing why cutting down on plastic waste matters for both the environment and what we eat.
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Growing chilli peppers in soil contaminated with five different microplastic types — including PVC, PS, HDPE, LDPE, and PET — significantly reduced nutritional quality, with PVC causing the greatest losses in protein, vitamins A and B6, and fatty acids. This research demonstrates a direct pathway by which soil microplastic pollution could degrade the nutritional value of food crops, with implications for food security and human health.
Impacts of polyethylene microplastics on soil microbial communities and metabolism in broomcorn millet (Panicum miliaceum L.)
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Scientists buried tiny plastic bits (the kind that break down from everyday plastic waste) in soil growing millet, a common grain crop, and found that even small amounts of this plastic pollution disrupt the soil's chemistry and shift the balance of bacteria that keep soil healthy. This matters because soil microbes help crops absorb nutrients and stay resilient, so as microplastic pollution builds up in farmland worldwide, it could quietly affect the quality and safety of the food we grow, making this an early warning sign worth watching, even though the study didn't directly test food safety or human health effects.
Increasing concentration of pure micro- and macro-LDPE and PP plastic negatively affect crop biomass, nutrient cycling, and microbial biomass
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Researchers grew maize in soil mixed with pure polyethylene and polypropylene plastics of different sizes and found that higher plastic concentrations reduced crop biomass, disrupted nutrient cycling, and decreased soil microbial activity. Even plastics without chemical additives negatively affected plant growth, showing that the plastic material itself is harmful to soil health. This matters for food security because agricultural soils are accumulating plastic from mulch films and other farming materials.
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