Iskandar I, Irwanti I. Use of Volcanic Sand as a Natural Fertilizer: Increasing Release of NutrientsUse of Volcanic Sand as a Natural Fertilizer: Increasing Release of Nutrients. J. Il. Tan. Lingk. [Internet]. 2003Apr.1 [cited 2024Nov.22];5(1):23-8. Available from: https://journal.ipb.ac.id/index.php/jtanah/article/view/2332