Kasno, A, Abdul Rachim, Iskandar Iskandar, and J. Sri Adiningsih. “Relationship Between K Ca Ratios in the Soil Solution With the Dynamic of K in Ultisol and Vertisol of Upland Area”. Jurnal Ilmu Tanah dan Lingkungan 6, no. 1 (April 1, 2004): 7–13. Accessed January 13, 2026. https://journal.ipb.ac.id/jtanah/article/view/2336.