Primayuda, Aris, Abraham Suriadikusumah, and M Amir Solihin. “Identifying Pyrite Layer Depth and Its Association to Oil Palm Health and Productivity (Elaeis Guineensis Jacq.) ( A Case Study at PT Sawit Sumbermas Sarana Tbk’s Oil Palm Plantation )”. Jurnal Ilmu Tanah dan Lingkungan 24, no. 1 (March 14, 2022): 6-13. Accessed February 2, 2023. https://journal.ipb.ac.id/index.php/jtanah/article/view/39630.