PSILPH is the federation of acid soil plant and soil science societies in the world. This website provides general information on the PSILPH. This society advances our scientific understanding of and promotes researches on acid soils and improved crop production on acid soils that comprise up to 40% of the world’s arable lands. The PSILPH contributes to the sustainable development in acid soil regions of the world through the integration and harmonization of agricultural production and sustainability, and environmental protection.