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Effects of Soil Microplastics on Plant Growth and Soil Health
Summary
A greenhouse experiment found that polyethylene and polypropylene microplastics at increasing concentrations reduced lettuce biomass, altered soil microbial activity, and changed soil structure and water retention, with effects more pronounced at higher MP concentrations.
Microplastics (MPs; <5 mm) are emerging contaminants in terrestrial ecosystems, yet their effects on soil health and plant growth remain poorly understood. This study investigates the impact of polyethylene (PE) and polypropylene (PP) microplastics on soil properties, microbial activity, and the growth of Lactuca sativa (lettuce). Soil was artificially contaminated with MPs at concentrations of 0.5%, 1%, and 2% (w/w). After a 60-day greenhouse experiment, MP-treated soils showed reduced water retention (−15–20%) and microbial biomass (−25%). Lettuce grown in MP-contaminated soil exhibited stunted root growth (−30%) and decreased biomass (−22%). These findings highlight the need for sustainable agricultural practices to mitigate microplastic pollution