Importance of proton supply and calcium‐sink size in the dissolution of phosphate rock materials of different reactivity in soilRobinson, J. S. ORCID: https://orcid.org/0000-0003-1045-4412, Syers, J. K. and Bolan, N. S. (1992) Importance of proton supply and calcium‐sink size in the dissolution of phosphate rock materials of different reactivity in soil. European Journal of Soil Science, 43 (3). pp. 447-459. ISSN 1351-0754 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1111/j.1365-2389.1992.tb00151.x Abstract/SummaryThe dissolution of a range of phosphate rock (PR) materials (Gafsa, GPR; Jordan, JPR; North Florida, NFPR; and Tundulu, TPR) was evaluated in three UK soils (Nercwys, Davidstow and Withnell) which differed in proton supply and P-buffer capacity. The Ca-sink size was adjusted by adding different amounts of a cation-exchange resin (CER) to the soils. In the presence of a large proton supply (pHw 3.8–4.8, pH-buffer capacity 52.5–36.5 mmol OH− kg−1 pH unit−1), the dissolution of GPR, JPR and NFPR in the Nercwys and Davidstow soil-CER mixtures was strongly influenced by the size of the Ca sink. A twofold increase in Ca-sink size in these two soils caused an increase in PR dissolution of 44–120%. Except for TPR, the increase in PR dissolution per unit increase in Ca-sink size was the same for the three PR materials. In the Withnell soil-CER mixtures, where the initial proton supply was relatively small (pHw 4.8–6.1, pH-buffer capacity 23.7–21.4 mmol OH− kg−1 pH unit−1), the increase in PR dissolution with increasing Ca-sink size was less (24–68%) than in the other two soils (44–120%). Also, for the Withnell soil, the increase in PR dissolution with increasing Ca-sink size decreased in the order GPR (68%) > JPR (49%) > NFPR (24%), a trend consistent with the decrease in PR reactivity. The maximum dissolution of TPR was only 8–22% under favourable conditions of proton supply and Ca sink, and was little affected by Ca-sink size.
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