Data/hora: 18/06/2024 14:32:56

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 15/07/1999
Data da última atualização: | 15/07/1999
Autoria: | NEUFELDT, H.
Título: | Physical and chemical properties of selected oxisols 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.37-50.
Idioma: | Inglês
Conteúdo: | Profiles of selected very fine, allitic, isohyperthermic, Anionic Acrustox and coarse-loamy, mixed, isohyperthermic, Typic Haplustox under different management systems were analyzed chemically and physically. On each of the two substrates, a conventional crop rotation, a degraded pastures, and a tree plantation were selected. Native savanna was used as control. Exhange capacity, most exchangeable cations, and phosphorus were selected. Native savanna was used as control. Exchange capacity, mosth exchangeable cations, and phosphorus were strongly related to soil organic carbon while pedogenic Fe and Al oxides were less related. Soil organic matter also controlled the formation of stable microaggregates and the degree of clay dispersion, and must therefore be seen as a key component in these soils. Management affected both the physical and chemical properties of the soils. Liming elevated the pH, increased the number of variable exchange sites, and altered clay flocculation. Such changes may have implications for pore-size distribution. Seedbed preparation resulted in soil compaction and reduced total pore volume. The loss was, however, restricted to macropores, whereas mesoporosity even increased. Given the small amount of capillary water available to plants in Oxisols, this change may be seen as positive.
Palavras-Chave: | Propriedade fisico-quimica do solo; Soil chemicophysical properties.
Thesagro: | Cerrado; Oxisol.
Thesaurus Nal: | Ferralsols.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (2453-1) - ADD - PL - -- - CRI4998 -  - CRI4998 - DIS