Polypropylene microfibers negatively affect soybean growth and nitrogen fixation regardless of soil type and mycorrhizae presence.

Recent studies have indicated that soil contamination with microplastics (MPs) can negatively affect agricultural productivity, although these effects vary greatly depending on the context. Furthermore, the mechanisms behind these effects remain largely unknown. In this study, we examined the impact of two concentrations of polypropylene (PP) fibers in the soil (0.