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Predicting the Dissolution of Rock Phosphates in Flooded Acid Sulfate Soils

^a Dep. of Soil Science, Faculty of Agriculture, Kasetsart University, 50 Phaholyothin Rd, Jatujak, Bangkok, Thailand
^b Dep. of Tropical Plant and Soil Sci., Univ. of Hawaii at Manoa, 3190 Maile Way, Honolulu, HI 96822

View larger version (42K): [in a new window]   Fig. 1. Dissolution of Kanchanaburi rock phosphate (KRP) as represented by the differences in NaOH-extractable-P, Mitscherlich fit curve and changes of soil pH between KRP-amended (KRP 500 mg P kg–1) and KRP unamended soils (KRP 0 mg P kg–1) in acid sulfate soils initially and after amending with KRP.

View larger version (43K): [in a new window]   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.

View larger version (42K): [in a new window]   Fig. 3. Dissolution of Kanchanaburi rock phosphate with soluble phosphate (KRPS) as represented by the differences in NaOH-extractable-P, Mitscherlich fit curve, and changes of soil pH between KRPS-amended (KRPS 500 mg P kg–1) and KRPS unamended soils (KRPS 0 mg P kg–1) in acid sulfate soils.

View larger version (16K): [in a new window]   Fig. 4. Phosphorus extractability from rock phosphate in acid sulfate soils as presented by the differences in Bray-1 extractable P content between RP-amended (RP 500 mg P kg–1) and RP unamended soils (RP 0 mg P kg–1)

View larger version (18K): [in a new window]   Fig. 5. Phosphorus extractability from RP in acid sulfate soils as presented by the differences in Bray-2 extractable P content between RP-treated (RP 500 mg P kg–1) and RP untreated soils (RP 0 mg P kg–1)

View larger version (16K): [in a new window]   Fig. 6. The NaOH_P/Bray 2 ratios from rock phosphates in acid sulfate soils during submergence.