Boniao, Renato, Jusop Shamshuddin, Eric Van Ranst, Siti Zauyah, and Syed Syed Omar. “AMELIORATION OF SOIL FERTILITY IN VARIABLE-CHARGE DOMINATED SOILS”. Mindanao Journal 26, no. THE ANNUAL SERIES (June 11, 2025): 105–119. Accessed March 6, 2026. https://msu-mindanaojournal.com/index.php/ojs/article/view/430.