Calibration of Soil Phosphorus Test for Upland Rice Grown on Typic Kandiudox, Way Pangubuan, Lampung. JOURNAL OF TROPICAL SOILS, [S. l.], v. 23, n. 2, p. 81–89, 2019. DOI: 10.5400/jts.2018.v23i2.81-89. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/267. Acesso em: 30 oct. 2025.