Data/hora: 03/06/2024 03:41:38

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 16/07/1999
Data da última atualização: | 16/07/1999
Autoria: | WESTERHOF, R.; VILELA, L.; AYARZA, M. A.; ZECH, W.
Título: | Labile N and the nitrogen management index of oxissols in the Brazilian cerrados.
Ano de publicação: | 1999
Fonte/Imprenta: | In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999.
Páginas: | p.133-140.
Idioma: | Inglês
Conteúdo: | 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 systems analysis, total N and labile 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 pastures/crop rotations was higher than under native savanna and continuous cropping systems.
Thesagro: | Cerrado; Manejo; Mineralização; Nitrogênio; Oxisol; Permanganato de Potássio; Uso da Terra.
Thesaurus Nal: | Ferralsols; land use; mineralization; nitrogen; potassium permanganate.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (2460-1) - UPC - PL - -- - CRI4998 -  - CRI4998 - DIS