Waraningtyas, I., Iskandar, & Anwar, S. (2026). Phosphorus and Potassium Availability in Soil Ameliorated by Different Quality Organic Materials Enriched with Humic Substances. Jurnal Ilmu Tanah Dan Lingkungan, 28(1), 20-27. https://doi.org/10.29244/jitl.28.1.20-27