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| Titel: |
Phosphate mobilization and immobilization in two soils incubated under simulated reducing conditions |
| Auteur: |
Jensen, Marina Bergen Hansen, Hans Christian Bruun Nielsen, Niels Erik Magid, Jakob |
| Verschenen in: |
Acta agriculturae Scandinavica. Section B, Soil and plant science |
| Paginering: | Jaargang 48 (1998) nr. 1 pagina's 11-17 |
| Jaar: |
1998-03 |
| Inhoud: |
Inorganic phosphate (P) associated with Fe(III) (hydr)oxides can be mobilized by reductive dissolution of the oxides. Bulk Ap samples from two loamy soils differing by nearly 50% in total P were amended with 6 or 60 mg glucose-C per 100 g soil at a water tension of 0.2 m. During 29 days of anoxic incubation at room temperature, the soil solution pH, concentrations of Fe(II) and molybdate reactive P were measured. The concentrations of P were correlated to neither total soil-P nor Fe(II) concentrations. Lack of proportionality between Fe(II) and P in solution was attributed to microbial uptake, resorption of P and also, at high Fe(II)-concentrations, to precipitation of Fe(II)-P compounds (e.g. vivianite). The highest P concentrations were observed in samples amended with the low-C dose, where the concentrations increased six-fold to approximately 0.3 mg PO4-P 1-1. This indicated that P leaching might increase from clayey soils subjected to moderately reducing conditions. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 10 gevonden artikelen
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