Kasno, Antonius, Diah Setyorini, and Sutisni Dwiningsih. “Solubility of Rock Phosphate and Its Effect to the Growth and Yield of Maize on Ultisols”. JOURNAL OF TROPICAL SOILS 13, no. 1 (January 1, 2008): 11–22. Accessed July 27, 2025. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/2.