Effect of temperature and flooding duration on phosphate sorption in an acid sulphate soil from Vietnam
(1995) European Journal of Soil Science —
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- Abstract
- Phosphate sorption in soil is controlled largely by Fe-oxihydroxides, and so important changes in P dynamics are expected when the redox potential is modified. Such changes in P sorption when acid soil is flooded, as for rice cultivation, have been evaluated. Samples from an acid sulphate soil in the Mekong Delta of Vietnam were hooded for up to 56 d at 20 degrees C and 30 degrees C. Some of the samples incubated at 30 degrees C were dried in open air for 30 d after Flooding. Small redox potential (Eh < 0) and pH > 6 were rapidly reached in soil flooded at 30 degrees C; less drastic reducing conditions (Eh congruent to 0.2 V) and pH 4-5 occurred at 20 degrees C. Phosphate sorption increased during flooding. The increase was twofold at 20 degrees C, and 10-fold at 30 degrees C. Phosphate sorption index decreased in the soil that was air dried after flooding at 30 degrees C, but still remained two to three times greater than before flooding. These results were compared to the changes in oxalate-er;tractable Fe, i.e. poorly crystalline or amorphous Fe-oxihydroxides. The increase of P sorption per unit increase of oxalate-Fe was seven to eight fold larger at 30 degrees C than at 20 degrees C.
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Quang, V., & Dufey, J. (1995). Effect of temperature and flooding duration on phosphate sorption in an acid sulphate soil from Vietnam. European Journal of Soil Science. https://doi.org/10.1111/j.1365-2389.1995.tb01360.x