Minjingu Phosphate Rock （MPR） from Northern Tanzania and the Ikutha Phosphate Rock （IPR） found in Central-Southeast Kenya are well documented as potential sources of phosphorous （P） available in East Africa. On-...Minjingu Phosphate Rock （MPR） from Northern Tanzania and the Ikutha Phosphate Rock （IPR） found in Central-Southeast Kenya are well documented as potential sources of phosphorous （P） available in East Africa. On-farm trials in phosphate-deficient soils in Western Kenya demonstrated MPR to be as effective as triple superphosphate （TSP） - 20% P, at equal P rates. The aim of this work is to determine the distribution of phosphorus in these phosphate rocks （PRs）. The different phosphorus fractions were extracted using the modified Williams extraction procedure and analysis carried on a UV/VIS spectrometer （SHIMADZU UV-220-02 and NOVASPEC II）. The analysis showed that the most abundant form of phosphorus in the phosphate rocks was the Inorganic Phosphorus （IP） contributing 74.20% of total phosphorus （TP） for Minjingu, and 83,28% of total phosphorus for Ikutha phosphate rock.展开更多
文摘Minjingu Phosphate Rock （MPR） from Northern Tanzania and the Ikutha Phosphate Rock （IPR） found in Central-Southeast Kenya are well documented as potential sources of phosphorous （P） available in East Africa. On-farm trials in phosphate-deficient soils in Western Kenya demonstrated MPR to be as effective as triple superphosphate （TSP） - 20% P, at equal P rates. The aim of this work is to determine the distribution of phosphorus in these phosphate rocks （PRs）. The different phosphorus fractions were extracted using the modified Williams extraction procedure and analysis carried on a UV/VIS spectrometer （SHIMADZU UV-220-02 and NOVASPEC II）. The analysis showed that the most abundant form of phosphorus in the phosphate rocks was the Inorganic Phosphorus （IP） contributing 74.20% of total phosphorus （TP） for Minjingu, and 83,28% of total phosphorus for Ikutha phosphate rock.
