WINARSO, S.; TAUFIQ, A. Aluminum Exchangeable and Phosphorous Availability on Ultisol Using Humic Substance and Synthetic Organic Acid. JOURNAL OF TROPICAL SOILS, [S. l.], v. 16, n. 3, p. 183–190, 2019. DOI: 10.5400/jts.2011.v16i3.183-190. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/298. Acesso em: 31 aug. 2025.