“Correlation Between Soil Test Phosphorus of Kaolinitic and Smectitic Soils With Phosphorus Uptake of Lowland Rice”. JOURNAL OF TROPICAL SOILS 14, no. 3 (September 1, 2009): 205–209. Accessed January 4, 2026. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/87.