Data/hora: 19/06/2024 08:55:48

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