MAHBUB, M. Variable Charge of Ultisols due to Phosphate Application and Incubation Time. JOURNAL OF TROPICAL SOILS, [S. l.], v. 15, n. 2, p. 103–109, 2018. DOI: 10.5400/jts.2010.v15i2.103-109. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/46. Acesso em: 5 aug. 2025.