The Effectiveness of Humus Acids from Different Sources in Improving Phosphorus Availability in Soils with Varying Gypsum Content. Euphrates journal of agricultural science, [S. l.], v. 18, n. 3, 2026. Disponível em: https://ejs-agri.com/index.php/EJAS/article/view/480. Acesso em: 4 nov. 2026.