UTAMI, S. W.; TARIGAN, R. A. P.; WIDIANINGSIH, B. Characterization of Micronutrients and Heavy Metal Content in Organic Fertilizer Made From Fly Ash and Organic Waste. JOURNAL OF TROPICAL SOILS, [S. l.], v. 24, n. 1, p. 11–16, 2019. DOI: 10.5400/jts.2019.v24i1.11-16. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/340. Acesso em: 27 jul. 2025.