Zinc Sorption in Calcareous Soils as Influenced by Biochar and Humic Acid: A Langmuir and Freundlich Isotherm Study. EJAS [Internet]. 2026 Sep. 30 [cited 2026 Nov. 2];18(3). Available from: https://ejs-agri.com/index.php/EJAS/article/view/390