Labile N and the nitrogen management index of oxisols in the Brazilian cerrados
The effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) for...
| 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/10568/55133 |
| _version_ | 1855532716675563520 |
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| author | Westerhof, R Vilela, Lourival Ayarza, Miguel Angel Zech, W. |
| author_browse | Ayarza, Miguel Angel Vilela, Lourival Westerhof, R Zech, W. |
| author_facet | Westerhof, R Vilela, Lourival Ayarza, Miguel Angel Zech, W. |
| author_sort | Westerhof, R |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) for the carbon management index. In all systems, labile N released by potassium permanganate was a better indicator for nitrogen availability than were total and stable N. The NMI was a good indicator for N availability but gave no information on the total amount of N. In land-use system analysis, total N and labile N can be used together as a simple and rapid way to evaluate the nitrogen status of the soil. Legume-based pastures specifically increased the amount of labile N. Although soybeans had a dominant role in the continuous cropping systems studied, total N contents decreased, compared with native savanna. The availability of N under legume-based pastures and legume-based pasture/crop rotations was higher than under native savanna and continuous cropping systems. |
| format | Book Chapter |
| id | CGSpace55133 |
| 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 | CGSpace551332024-01-17T12:58:34Z Labile N and the nitrogen management index of oxisols in the Brazilian cerrados Westerhof, R Vilela, Lourival Ayarza, Miguel Angel Zech, W. savannas land use mineralization nitrogen content oxisols potassium permanganate sabanas utilización de la tierra mineralización contenido de nitrógeno oxisoles permanganato de potasio The effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) for the carbon management index. In all systems, labile N released by potassium permanganate was a better indicator for nitrogen availability than were total and stable N. The NMI was a good indicator for N availability but gave no information on the total amount of N. In land-use system analysis, total N and labile N can be used together as a simple and rapid way to evaluate the nitrogen status of the soil. Legume-based pastures specifically increased the amount of labile N. Although soybeans had a dominant role in the continuous cropping systems studied, total N contents decreased, compared with native savanna. The availability of N under legume-based pastures and legume-based pasture/crop rotations was higher than under native savanna and continuous cropping systems. 1999 2015-01-28T14:17:28Z 2015-01-28T14:17:28Z Book Chapter https://hdl.handle.net/10568/55133 en Open Access International Center for Tropical Agriculture Westerhof, Roelof; Vilela, Lourival; Ayarza, Miguel Angel; Zech, Wolfgang. 1999. Labile N and the nitrogen management index of oxisols in 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. 133-140. (CIAT publication no. 312) |
| spellingShingle | savannas land use mineralization nitrogen content oxisols potassium permanganate sabanas utilización de la tierra mineralización contenido de nitrógeno oxisoles permanganato de potasio Westerhof, R Vilela, Lourival Ayarza, Miguel Angel Zech, W. Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title | Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title_full | Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title_fullStr | Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title_full_unstemmed | Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title_short | Labile N and the nitrogen management index of oxisols in the Brazilian cerrados |
| title_sort | labile n and the nitrogen management index of oxisols in the brazilian cerrados |
| topic | savannas land use mineralization nitrogen content oxisols potassium permanganate sabanas utilización de la tierra mineralización contenido de nitrógeno oxisoles permanganato de potasio |
| url | https://hdl.handle.net/10568/55133 |
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