The Changes of P-fractions and Solubility of Phosphate Rock in Ultisol Treated by Organic Matter and Phosphate Rock. j Trop. Soils [Internet]. 2013 Jan. 25 [cited 2025 Nov. 13];17(3):203-10. Available from: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/153