Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems
Chemical sequential extraction is widely used to divide soil phosphorus (P) into different inorganic (Pi) and organic (Po) fractions, but the assignment of these fractions to pools of differing plant availability, especially for low P tropical soils, is still matter of discussion. To improve this as...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
2002
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/44090 |
| _version_ | 1855522601109028864 |
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| author | Buehler, S. Oberson, Astrid Rao, Idupulapati M. Friesen, Dennis K. Frossard, Emmanuel |
| author_browse | Buehler, S. Friesen, Dennis K. Frossard, Emmanuel Oberson, Astrid Rao, Idupulapati M. |
| author_facet | Buehler, S. Oberson, Astrid Rao, Idupulapati M. Friesen, Dennis K. Frossard, Emmanuel |
| author_sort | Buehler, S. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Chemical sequential extraction is widely used to divide soil phosphorus (P) into different inorganic (Pi) and organic (Po) fractions, but the assignment of these fractions to pools of differing plant availability, especially for low P tropical soils, is still matter of discussion. To improve this assignment, the effect of land-use systems and related P fertilizer inputs on size of P fractions and their isotopic exchangeability was investigated. A Colombian Oxisol, sampled from a long-term field experiment with contrasting management treatments, was labeled with carrier free 33P and extracted after incubation times of 4 h, 1, and 2 wk. Phosphorus concentrations and 33P recovery in fractions sequentially extracted with anion exchange resin (Pi), 0.5 M NaHCO3 (Bic-Pi, Bic-Po), 0.1 M NaOH (Pi, Po), hot concentrated HCl (Pi, Po), and residual P were measured for each incubation time. Resin-Pi, Bic-Pi, NaOH-Pi, and hot HCl-Pi were increased with P fertilization, with the highest increase for NaOH-Pi The recovery of 33P in the treatments with annual P fertilization clearly exceeding P outputs indicate that resin-Pi, Bic-Pi, and NaOH-Pi represented most of the exchangeable P. In these treatments, label P transformed with increasing incubation time from the resin to the Bic-Pi and NaOH-Pi fractions. The organic or recalcitrant inorganic fractions contained almost no exchangeable P. In contrast, in soils with low or no P fertilization, more than 14% of the 33P was recovered in NaOH-Po and HCl-Po fractions 2 wk after labeling, showing that organic P dynamics are important when soil Pi reserves are limited. |
| format | Journal Article |
| id | CGSpace44090 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2002 |
| publishDateRange | 2002 |
| publishDateSort | 2002 |
| record_format | dspace |
| spelling | CGSpace440902025-11-12T05:54:54Z Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems Buehler, S. Oberson, Astrid Rao, Idupulapati M. Friesen, Dennis K. Frossard, Emmanuel acid soils phosphorus soil chemicophysical properties ferralsols land use suelo ácido fósforo propiedades físico - químicas suelo ferralsoles utilización de la tierra Chemical sequential extraction is widely used to divide soil phosphorus (P) into different inorganic (Pi) and organic (Po) fractions, but the assignment of these fractions to pools of differing plant availability, especially for low P tropical soils, is still matter of discussion. To improve this assignment, the effect of land-use systems and related P fertilizer inputs on size of P fractions and their isotopic exchangeability was investigated. A Colombian Oxisol, sampled from a long-term field experiment with contrasting management treatments, was labeled with carrier free 33P and extracted after incubation times of 4 h, 1, and 2 wk. Phosphorus concentrations and 33P recovery in fractions sequentially extracted with anion exchange resin (Pi), 0.5 M NaHCO3 (Bic-Pi, Bic-Po), 0.1 M NaOH (Pi, Po), hot concentrated HCl (Pi, Po), and residual P were measured for each incubation time. Resin-Pi, Bic-Pi, NaOH-Pi, and hot HCl-Pi were increased with P fertilization, with the highest increase for NaOH-Pi The recovery of 33P in the treatments with annual P fertilization clearly exceeding P outputs indicate that resin-Pi, Bic-Pi, and NaOH-Pi represented most of the exchangeable P. In these treatments, label P transformed with increasing incubation time from the resin to the Bic-Pi and NaOH-Pi fractions. The organic or recalcitrant inorganic fractions contained almost no exchangeable P. In contrast, in soils with low or no P fertilization, more than 14% of the 33P was recovered in NaOH-Po and HCl-Po fractions 2 wk after labeling, showing that organic P dynamics are important when soil Pi reserves are limited. 2002 2014-10-02T08:33:13Z 2014-10-02T08:33:13Z Journal Article https://hdl.handle.net/10568/44090 en Open Access application/pdf |
| spellingShingle | acid soils phosphorus soil chemicophysical properties ferralsols land use suelo ácido fósforo propiedades físico - químicas suelo ferralsoles utilización de la tierra Buehler, S. Oberson, Astrid Rao, Idupulapati M. Friesen, Dennis K. Frossard, Emmanuel Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title | Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title_full | Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title_fullStr | Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title_full_unstemmed | Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title_short | Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems |
| title_sort | sequential phosphorus extraction of a 33p labeled oxisol under contrasting agricultural systems |
| topic | acid soils phosphorus soil chemicophysical properties ferralsols land use suelo ácido fósforo propiedades físico - químicas suelo ferralsoles utilización de la tierra |
| url | https://hdl.handle.net/10568/44090 |
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