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Santi IN. Palm Oil Mill Efluent - Zeolite Mixture Improves Acid and Base Cations in Acid Sulfate Soil. j Trop. Soils [Internet]. 2020Jan.2 [cited 2025Aug.2];25(1):21-7. Available from: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/345