Data/hora: 25/06/2024 08:59:32

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	05/09/1996	
Data da última atualização: 	06/02/2019	
Autoria: 	LILIENFEIN, J.; FREIBAUER, A.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; RESCK, D. V. S.; ZECH, W.	
Título: 	Influence of land-use on the distribution of water stable aggregates and P status of sandy and clayey cerrado oxisols, Brazil.	
Ano de publicação: 	1996	
Fonte/Imprenta: 	In: SIMPOSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasilia, DF. Biodiversidade e producao sustentavel de alimentos e fibras nos Cerrados: anais... Planaltina: EMBRAPA-CPAC, 1996.	
Páginas: 	p.323-328.	
Idioma: 	Inglês	
Conteúdo: 	Aggregate fractionation and a modified Hedley P fractionation were used to study the effects of land-use (conventional tillage and pasture in comparison to savanna) on bulk soil and macroaggregate fractions of a sandy and a clayey Cerrado Oxisol of Brazil. The size distribution of water-stable aggregates under native Cerrado savanna is similar in the sandy and clayey soil. The large macroaggregate fraction (2-8 mm) is depleted under crop by 75% and 30% in the sandy and the clayey soil, respectively. Large macroaggregates are enriched in organic P relative to bulk soil only in the sandy Oxisol. In the clayey soil total P concentrations are three times higher than in the sandy soil. In both soils the most important P fractions are stable Fe associated inorganic P and organic P in savanna and pasture, but Al associated inorganic P form crops.Tthe absolute concentrations of organic P are higher for crop than for savanna and pasture soils, but the proportion of organic P to plant available P is reduced. After ten years of conventional tillage, aggregation and P status of the clayey Oxisol do not indicate strong degradation as small differences were encountered between the management systems. For the sandy crop a soil organic matter conserving management system is recomended to reduce aggregate disruption and depledtion of formerly protected P fractions.	
Palavras-Chave: 	BIBJICACPAC; Brasil.	
Thesagro: 	Cerrado; Fósforo; Fração do Solo; Latossolo; Manejo do Solo; Pastagem; Solo Arenoso; Solo Argiloso; Uso da Terra.	
Thesaurus Nal: 	Brazil; clay soils; Ferralsols; land use; pastures; phosphorus; sandy soils; soil management.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/192136/1/ID08787-CRI4014-web.pdf	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (8826-1) - UMT - PL - -- - CRI4014 -  - CRI4014 - DIS