Increasing environmental stresses make crops ever more succeptible to the impact of plant viruses. Plant viruses affect plant functioning and, specifically, the root system. For example, virus infected cover crops may hamper root growth and activity. This may influence the effect of cover crops on the cycling of carbon and other nutrients in soils. Consequently, virus infections may undermine the beneficial use of cover crops to improve soil health, with unclear consequences for soil carbon storage, greenhouse gas emissions, and nutrient status. This project therefore tests how plant virus infection influences the impact of cover crops on soil carbon and nutrient cycling.