Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados
We examined whole-soil samples and particle-size fractions to study the distribution of different phosphorus (P) fractions after land-use change from native savanna to crops, pasture, and reforestation on clayey and loamy Oxisols of the Brazilian savannas. Phosphorus was extracted sequentially, acco...
| Autores principales: | , , , |
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
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International Center for Tropical Agriculture
1999
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/55135 |
| _version_ | 1855538198213558272 |
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| author | Westerhof, R Silva, J.E. da Ayarza, Miguel Angel Zech, W. |
| author_browse | Ayarza, Miguel Angel Silva, J.E. da Westerhof, R Zech, W. |
| author_facet | Westerhof, R Silva, J.E. da Ayarza, Miguel Angel Zech, W. |
| author_sort | Westerhof, R |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | We examined whole-soil samples and particle-size fractions to study the distribution of different phosphorus (P) fractions after land-use change from native savanna to crops, pasture, and reforestation on clayey and loamy Oxisols of the Brazilian savannas. Phosphorus was extracted sequentially, according to a modified Hedley procedure, into inorganic and organic P (NaOH-extractable Pi and Po, respectively), and recalcitrant P (P HCl and P res). Under natural conditions of strong P deficiency, over 60% of NaOH-extractable P was organic, reflecting the high contribution of P. to plant nutrition. Fertilization elevated inorganic P forms but had only small effects on Po. The increase of inorganic P forms from fertilizer P was greatest in the P, and lowest in the fractions. After fertilization, the reforested sites maintained high NaOH-extractable P through efficient recycling, whereas at the crop and pasture sites, P tended to accumulate in recalcitrant forms. Possibly, the adsorption of P to oxyhydroxides was reduced at the more acid reforested sites by complexation of Fe and Al oxides with organic acids. The ratio of NaOH-extractable P. to P. appeared to effectively reflect the P status of the land-use systems, and P deficiency increased in ascending order from native savanna > pasture > reforestation > crop, independently of soil type. |
| format | Book Chapter |
| id | CGSpace55135 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace551352025-11-05T17:06:37Z Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados Westerhof, R Silva, J.E. da Ayarza, Miguel Angel Zech, W. savannas land use phosphorus oxisols particle size sabanas utilización de la tierra fósforo oxisoles tamaño de la partícula We examined whole-soil samples and particle-size fractions to study the distribution of different phosphorus (P) fractions after land-use change from native savanna to crops, pasture, and reforestation on clayey and loamy Oxisols of the Brazilian savannas. Phosphorus was extracted sequentially, according to a modified Hedley procedure, into inorganic and organic P (NaOH-extractable Pi and Po, respectively), and recalcitrant P (P HCl and P res). Under natural conditions of strong P deficiency, over 60% of NaOH-extractable P was organic, reflecting the high contribution of P. to plant nutrition. Fertilization elevated inorganic P forms but had only small effects on Po. The increase of inorganic P forms from fertilizer P was greatest in the P, and lowest in the fractions. After fertilization, the reforested sites maintained high NaOH-extractable P through efficient recycling, whereas at the crop and pasture sites, P tended to accumulate in recalcitrant forms. Possibly, the adsorption of P to oxyhydroxides was reduced at the more acid reforested sites by complexation of Fe and Al oxides with organic acids. The ratio of NaOH-extractable P. to P. appeared to effectively reflect the P status of the land-use systems, and P deficiency increased in ascending order from native savanna > pasture > reforestation > crop, independently of soil type. 1999 2015-01-28T14:17:28Z 2015-01-28T14:17:28Z Book Chapter https://hdl.handle.net/10568/55135 en Open Access application/pdf International Center for Tropical Agriculture Westerhof, Roelof; Silva, José Eurípides da; Ayarza, Miguel Angel; Zech, Wolfgang. 1999. Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados. In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil quality. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 146-158. (CIAT publication no. 312) |
| spellingShingle | savannas land use phosphorus oxisols particle size sabanas utilización de la tierra fósforo oxisoles tamaño de la partícula Westerhof, R Silva, J.E. da Ayarza, Miguel Angel Zech, W. Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title | Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title_full | Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title_fullStr | Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title_full_unstemmed | Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title_short | Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados |
| title_sort | phosphorus fractions under different land use systems in oxisols of the brazilian cerrados |
| topic | savannas land use phosphorus oxisols particle size sabanas utilización de la tierra fósforo oxisoles tamaño de la partícula |
| url | https://hdl.handle.net/10568/55135 |
| work_keys_str_mv | AT westerhofr phosphorusfractionsunderdifferentlandusesystemsinoxisolsofthebraziliancerrados AT silvajeda phosphorusfractionsunderdifferentlandusesystemsinoxisolsofthebraziliancerrados AT ayarzamiguelangel phosphorusfractionsunderdifferentlandusesystemsinoxisolsofthebraziliancerrados AT zechw phosphorusfractionsunderdifferentlandusesystemsinoxisolsofthebraziliancerrados |