Abstract
Two phosphate rocks, one from Pesca (Colombia) and the other from Togo, were acidulated to various degrees with H2SO4 and H3PO4 for evaluation in varying granule size ranges. Products acidulated with H2SO4 were also prepared using different drying temperatures. Phosphorus availability was measured by dry-matter yield and P uptake in greenhouse experiments with maize.
It was observed that partial acidulation with H2SO4 was effective in increasing the water-soluble P level of phosphate rock when the drying temperature of the product was not excessive. Crop response and P uptake were both highly correlated to the water solubility of the product. The relative agronomic effectiveness (RAE) of Togo rock increased from 3% when unacidulated to 33%, 47%, and 52% when 20%, 30%, and 40%, respectively, of the H2SO4 required to make SSP was added. Similar results were obtained with Pesca rock. No consistent effect due to granule size was observed.
Twenty percent acidulation of Pesca rock with H3PO4 was 53–76% as effective as TSP with a single crop and 79–90% as effective over three cropping periods, showing a potential for high residual value.
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Hammond, L.L., Chien, S.H. & Polo, J.R. Phosphorus availability from partial acidulation of two phosphate rocks. Fertilizer Research 1, 37–49 (1980). https://doi.org/10.1007/BF01073563
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DOI: https://doi.org/10.1007/BF01073563