Data/hora: 03/06/2024 03:31:02

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 13/01/1999
Data da última atualização: | 13/01/1999
Autoria: | WESTERHOF, R.; VILELA, L.; AYARZA, M.; ZECH, W.
Título: | Land use effects on labile N extracted with permanganate and the nitrogen management index in the cerrado region of Brazil.
Ano de publicação: | 1998
Fonte/Imprenta: | Biology and Fertility of Soils, Berlin, v.27, p.353-357, 1998.
Idioma: | Inglês
Conteúdo: | The effect of and use on the availability of nitrogen (N) was studied by separating total N into a labile and a stable fraction by oxidation and extraction of labile N with KMnO4. The nitrogen management index (NMI) was calculated following the method of Blair et al. (1995) for the carbon management index. In all systems, labile N released by KMnO4 was a better indicator of N availability than total and stable N. The NMI was a good indicator of N availability but gave no information about the total amount of N. In land use system analysis, total N and labile N can used together as a simple and rapid way to evaluate the N status of the soil. Legume-based pastures specifically increased the amount of labile N. Although soybeans had a dominant role in the continuos cropping system studied, the total N contents of these systems were lower than those of the natural Cerrado. The availability of N under legume-based pastures and legume-based pasture-crop rotations was higher than under the natural Cerrado and the continuous cropping systems.
Thesagro: | Cerrado; Mineralização; Nitrogênio; Uso da Terra.
Thesaurus Nal: | land use; mineralization; nitrogen.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (1605-1) - UPC - SP - -- - CRI4830 -  - CRI4830 - DIS