Effect of redox conditions on phosphate exchangeability and iron forms in a soil amended with ferrous iron
- Author
- M Schärer, Eddy De Grave (UGent) , O Semalulu, S Sinaj, Robert Vandenberghe (UGent) and E Frossard
- Organization
- Abstract
- Application of iron (Fe) -rich amendments to soils has been proposed as a means of decreasing phosphorus (P) losses from soils. However, anoxic conditions following soil saturation are known to increase Fe and P solubility in soils, thus cancelling out the potential benefits. Our aim was to evaluate the effects of continuous oxic, continuous anoxic and alternating anoxic/oxic conditions on P exchangeability and Fe forms in soil amended with Ca(OH)(2) and FeSO(4). We incubated amended and unamended soils under these conditions for 8 weeks and measured Fe forms and P exchangeability. Under oxic conditions, addition of Ca(OH)(2) and FeSO(4) resulted in a strong decrease in P exchangeability and an increase in oxalate-extractable Fe. Mossbauer analyses suggested that an unidentified Fe oxide (D1oxide) with a strong sorbing capacity for P was precipitated. Under continuously anoxic conditions, P exchangeability and oxalate-extractable Fe increased with or without the amendments. Mossbauer analyses suggested that there was a partial dissolution of the D1oxide phase, precipitation of another unidentified Fe oxide (S3) and a reduction of structural Fe(3+) in phyllosilicate, thereby increasing soil negative charge. These transformations resulted in a strong increase in rapidly exchangeable P. Alternating anoxic and oxic periods induced the dissolution and precipitation of iron oxides and the increase and decrease in P exchangeability. Implications of the results for limiting P losses from grassland soils are discussed.
- Keywords
- TRANSFORMATION, DESORPTION, TERM, SORPTION, AVAILABILITY, PHOSPHORUS BEHAVIOR, FLOODED-DRAINED SOILS, MAIZE ROOT MUCILAGE, SOLUBILITY, ADSORPTION
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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-779578
- MLA
- Schärer, M., et al. “Effect of Redox Conditions on Phosphate Exchangeability and Iron Forms in a Soil Amended with Ferrous Iron.” EUROPEAN JOURNAL OF SOIL SCIENCE, vol. 60, no. 3, 2009, pp. 386–97, doi:10.1111/j.1365-2389.01135.x.
- APA
- Schärer, M., De Grave, E., Semalulu, O., Sinaj, S., Vandenberghe, R., & Frossard, E. (2009). Effect of redox conditions on phosphate exchangeability and iron forms in a soil amended with ferrous iron. EUROPEAN JOURNAL OF SOIL SCIENCE, 60(3), 386–397. https://doi.org/10.1111/j.1365-2389.01135.x
- Chicago author-date
- Schärer, M, Eddy De Grave, O Semalulu, S Sinaj, Robert Vandenberghe, and E Frossard. 2009. “Effect of Redox Conditions on Phosphate Exchangeability and Iron Forms in a Soil Amended with Ferrous Iron.” EUROPEAN JOURNAL OF SOIL SCIENCE 60 (3): 386–97. https://doi.org/10.1111/j.1365-2389.01135.x.
- Chicago author-date (all authors)
- Schärer, M, Eddy De Grave, O Semalulu, S Sinaj, Robert Vandenberghe, and E Frossard. 2009. “Effect of Redox Conditions on Phosphate Exchangeability and Iron Forms in a Soil Amended with Ferrous Iron.” EUROPEAN JOURNAL OF SOIL SCIENCE 60 (3): 386–397. doi:10.1111/j.1365-2389.01135.x.
- Vancouver
- 1.Schärer M, De Grave E, Semalulu O, Sinaj S, Vandenberghe R, Frossard E. Effect of redox conditions on phosphate exchangeability and iron forms in a soil amended with ferrous iron. EUROPEAN JOURNAL OF SOIL SCIENCE. 2009;60(3):386–97.
- IEEE
- [1]M. Schärer, E. De Grave, O. Semalulu, S. Sinaj, R. Vandenberghe, and E. Frossard, “Effect of redox conditions on phosphate exchangeability and iron forms in a soil amended with ferrous iron,” EUROPEAN JOURNAL OF SOIL SCIENCE, vol. 60, no. 3, pp. 386–397, 2009.
@article{779578,
abstract = {{Application of iron (Fe) -rich amendments to soils has been proposed as a means of decreasing phosphorus (P) losses from soils. However, anoxic conditions following soil saturation are known to increase Fe and P solubility in soils, thus cancelling out the potential benefits. Our aim was to evaluate the effects of continuous oxic, continuous anoxic and alternating anoxic/oxic conditions on P exchangeability and Fe forms in soil amended with Ca(OH)(2) and FeSO(4). We incubated amended and unamended soils under these conditions for 8 weeks and measured Fe forms and P exchangeability. Under oxic conditions, addition of Ca(OH)(2) and FeSO(4) resulted in a strong decrease in P exchangeability and an increase in oxalate-extractable Fe. Mossbauer analyses suggested that an unidentified Fe oxide (D1oxide) with a strong sorbing capacity for P was precipitated. Under continuously anoxic conditions, P exchangeability and oxalate-extractable Fe increased with or without the amendments. Mossbauer analyses suggested that there was a partial dissolution of the D1oxide phase, precipitation of another unidentified Fe oxide (S3) and a reduction of structural Fe(3+) in phyllosilicate, thereby increasing soil negative charge. These transformations resulted in a strong increase in rapidly exchangeable P. Alternating anoxic and oxic periods induced the dissolution and precipitation of iron oxides and the increase and decrease in P exchangeability. Implications of the results for limiting P losses from grassland soils are discussed.}},
author = {{Schärer, M and De Grave, Eddy and Semalulu, O and Sinaj, S and Vandenberghe, Robert and Frossard, E}},
issn = {{1351-0754}},
journal = {{EUROPEAN JOURNAL OF SOIL SCIENCE}},
keywords = {{TRANSFORMATION,DESORPTION,TERM,SORPTION,AVAILABILITY,PHOSPHORUS BEHAVIOR,FLOODED-DRAINED SOILS,MAIZE ROOT MUCILAGE,SOLUBILITY,ADSORPTION}},
language = {{eng}},
number = {{3}},
pages = {{386--397}},
title = {{Effect of redox conditions on phosphate exchangeability and iron forms in a soil amended with ferrous iron}},
url = {{http://doi.org/10.1111/j.1365-2389.01135.x}},
volume = {{60}},
year = {{2009}},
}
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