Tamatamah , R. A. “Phosphorus Sorption in Relation to Soil Grain Size and Geochemical Composition in the Simiyu and Kagera River Basins, Tanzania”. Tanzania Journal of Science 31, no. 2 (April 18, 2021): 33–39. Accessed July 26, 2025. http://www.tjs.udsm.ac.tz/index.php/tjs/article/view/385.