On October 16-21, 2023, the 11th International Symposium on Plant-Soil Interactions at Low pH (PSILPH) was organized in Nanjing, China. A total of 49 oral reports and 82 posters were presented during the 11th PSILPH2023 under the theme of the sustainable utilization of acid soils, showcasing research in the areas of acid soils’ physical, chemical, and biological properties, physiological and molecular mechanisms of plant adaptation to acidic soils, nutrient utilization of crops on acid soils, genetics and breeding of crops for acid soils, mechanism and prediction of soil acidification, soil-microbe-plant interactions on acid soils, amelioration and fertilization of acid soils, sustainable utilization and management of agricultural and natural ecosystems on acid soils, forestry and agroforestry management on acid soils, effects of soil acidity on food quality and human health.