NDLI: Labile N and the nitrogen management index of oxisols in the Brazilian cerrados

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Labile N and the nitrogen management index of oxisols in the Brazilian cerrados

Content Provider	Consultative Group on International Agricultural Research (CGIAR)
Author	Westerhof, R Vilela, Lourival Ayarza, Miguel Angel Zech, W.
Spatial Coverage	Brazil [BR]
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.
Related Links	https://cgspace.cgiar.org/items/a321be9f-3d2f-4e1e-a191-21e29057ae8e
File Format	PDF
Language	English
Publisher	International Center for Tropical Agriculture
Publisher Date	1999-01-01
Access Restriction	Open
Subject Keyword	Savannas Land Use Mineralization Nitrogen Content Oxisols Potassium Permanganate Sabanas Utilización De La Tierra Mineralización Contenido De Nitrógeno Oxisoles Permanganato De Potasio Soil Health Soil Landscapes
Content Type	Text
Resource Type	Chapter
Subject	Agronomy and Crop Science Food Science Plant Science

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