Soils support 98% of global food production, yet agricultural practices and climate change impose stresses that threaten soil functions. The Soil'Stress project investigates how single and multiple stressors—such as organic carbon loss, compaction, agrochemicals, and climatic extremes—affect soil fertility and crop yields. Using field, lab, and greenhouse studies, as well as national mapping, it will identify which stressors most impair key soil functions and provide a risk assessments and maps for specific soil threats for Switzerland. The results will equip farmers, advisors, and policymakers with strategies to reduce soil threats, maintain long-term productivity, and secure resilient food production.