The pathways through which microplastics (plastic particles <5mm) and nanoplastics (<100nm) enter our soils are manifold: in addition to mulch films, foil tunnels and irrigation tubing used specifically for agricultural purposes, they enter soils e.g. through the application of municipal compost, digestates from biogas production and along roads through the abrasion of tires. Recent studies show that microplastics are present in all soils in Switzerland, even in remote nature reserves. The accumulation of microplastics in soil can adversely affect basic soil properties and vital soil functions. Despite the widespread presence of microplastics in soils, there are knowledge gaps regarding microplastics concentrations in soils, their effects on plant growth and soil health.
This study aims to quantify tire abrasion particles in grasslands near roads in the canton of Solothurn and to evaluate the effects of tire particle accumulation on soil properties. In addition, the study will evaluate microplastics concentrations in soils fertilized with recycled fertilizer (compost and digestate). By addressing these gaps in our knowledge, this project will deepen our understanding of the effects of microplastics on soil health.
Project coordination
