“The Effect of Rice Husk Biochar and Cow Manure on Some Soil Characteristics, N and P Uptake and Plant Growth of Soybean in Alfisol”. JOURNAL OF TROPICAL SOILS 27, no. 2 (March 15, 2022): 59–66. Accessed May 6, 2026. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/475.