Mari, C L P, J M Antonio, B M Adalberto, G L Elizabeth, and P L Fabian. “High-Alkaline Coconut Shell Biochar Modifies Nutrient Availability-Retention and Enzymatic Activity in Calcareous Soil: A Rapid Incubation Soil Test”. Plant Science Today (December 3, 2025). Accessed December 5, 2025. https://horizonepublishing.com/journals/index.php/PST/article/view/8939.