Labile N and the nitrogen management index of oxisols in the Brazilian cerrados
Material type: ArticleLanguage: English Description: p. 133-140Subject(s):- Savannas
- Land use
- Mineralization
- Nitrogen content
- Oxisols
- Potassium permanganate
- Brasil
- Sabanas
- Utilización de la tierra
- Mineralización
- Contenido de nitrógeno
- Oxisoles
- Permanganato de potasio
- Cerrados
- CIAT Editor
- Book chapters
- Capítulos de libros
- Química y física del suelo
- Cerrados
- Soil chemistry and physics
- Book chapters
- S 623 .S977
Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
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Books | CIAT Library CIAT Publications | CIAT Publications | S 623 .S977 (Browse shelf(Opens below)) | Available | |||||
Book Chapters | CIAT Library General Book Collection | General Book Collection | S 623 .S977 (Browse shelf(Opens below)) | c.1 | Available |
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.