Reductions in the deposition of sulfur and selenium to agricultural soils pose risk of future nutrient deficiencies

Abstract Atmospheric deposition is a major source of the nutrients sulfur and selenium to agricultural soils. Air pollution control cleaner energy production have reduced anthropogenic emissions selenium, which has led lower atmospheric fluxes these elements. Here, we use global aerosol-chemistry-climate model map recent (2005–2009) deposition, project future (2095–2099) changes under two socioeconomic scenarios. Across Northern Hemisphere, find substantially decreased soils, by 70 90% for 55 80% selenium. Recent trends in concentrations USA streams suggest that catchment mass balances elements are already changing due declining supply. Sustainable fertilizer management strategies will need be developed offset decrease nutrient supply ensure food security nutrition, while avoiding consequences downstream aquatic ecosystems.