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Fig. 2. Dissolution of Gafsa rock phosphate (RP) as represented by the differences in NaOH-extractable-P, Mitscherlich fit curve and changes of soil pH between Gafsa RP-amended (Gafsa RP 500 mg P kg^–1) and Gafsa RP unamended soils (Gafsa RP 0 mg P kg^–1) in acid sulfate soils.