Relações entre propriedades físicas e características de solos da região sul do Brasil

Giarola, Neyde Fabíola Balarezo; Silva, A. P.; Imhoff, Silvia

doi:10.1590/s0100-06832002000400005

Cited by 33 publications

(22 citation statements)

References 24 publications

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“…Just as for kaolinite, iron and aluminum oxides act indirectly on soil resistance, since they are associated with soil aggregation and structure. Its presence in soil conditions a granular structure, which may or may not influence the density and aggregation (Muggler et al, 1999;Giarola;Silva;Imhoff, 2002). The higher presence of iron oxides (hematite and goethite) usually conditions more stable aggregates, which may be associated with the structure of the mineral, not the characteristics that it imprints on the soil mass as Giarola, Silva and Imhoff (2002) point out.…”

Section: Resultsmentioning

confidence: 99%

“…Its presence in soil conditions a granular structure, which may or may not influence the density and aggregation (Muggler et al, 1999;Giarola;Silva;Imhoff, 2002). The higher presence of iron oxides (hematite and goethite) usually conditions more stable aggregates, which may be associated with the structure of the mineral, not the characteristics that it imprints on the soil mass as Giarola, Silva and Imhoff (2002) point out. In hematite, for example, there is a uniform packing of the oxygen atoms between one octahedron and another, whereas in the goethite there is no perfect packing between the oxygen atoms of an octahedron and hydrogen of anther, providing different structures to soils with different types and amounts of iron oxides.…”

Section: Resultsmentioning

confidence: 99%

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Soil susceptibility to compaction under use conditions in southern Brazil

et al. 2017

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The degree of soil compaction is intensified by its inadequate management, compaction being variable depending on soil type since even under identical management conditions, different types have different abilities to withstand load. The objective of this study was to evaluate the susceptibility to compaction of different classes of soils under no-tillage (NT) croping system compared to the original condition. Thus, i) soils with the same source material have distinct resistance to compression with increased NT adoption time; ii) the most sensitive indicators of this change are the ratios mass:volume and volume:volume and; iii) there is a relationship between resistance and compaction susceptibility with the amount and type of oxide. Soil samples were collected in areas under NT and under natural condition in order to assess the impact imposed by the NT on the attributes density and porosity, precompression stress and compressibility index and relate them to the oxide type of, and content in, the soils under study. The results show that the density and macroporosity were those most affected by the NT agricultural use, regardless of soil type, that is, its dynamic is related more to soil use and less to mineralogical characteristics. The soil resistance and compaction susceptibility were higher in soil developed in basalt, followed by those developed in sandstone and granite. Both the organic matter content and type and concentration of iron oxides were related to the soil resistance and susceptibility to compaction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Soil susceptibility to compaction under use conditions in southern Brazil

et al. 2017

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“…Esse resultado pode ser explicado pela interferência dos horizontes concrecionários a litoplínticos na flutuação do lençol freático nos LVA, que poderia resultar em ciclos repetidos de umedecimento e secagem nos perfis, e poderia proporcionar o enfraquecimento e quebra de agregados. No entanto, os bons índices de agregação observados em ambos os solos estão em conformidade com os de solos ricos em sesquióxidos (Lima & Anderson, 1997;Ferreira et al, 1999aFerreira et al, , 1999bGiarola et al, 2002;Pedrotti et al, 2003), inclusive com presença significativa de gibbsita. A maior estabilidade de agregados nos LV refletiu-se sobre a densidade aparente desses solos.…”

Section: Resultsunclassified

Drenagem interna como fator de diferenciação de Latossolos do Distrito Federal

Campos

Lacerda

Silva

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar a influência de características físico-hídricas dos solos em atributos diagnóstico de Latossolos. Realizou-se o levantamento de atributos morfológicos, químicos, físicos, mineralógicos e físico-hídricos de cinco perfis de Latossolos Vermelhos (LV) e cinco perfis de Latossolos Vermelho-Amarelos (LVA) petroplínticos, considerados representativos dessa classe de solos no Distrito Federal. Além da caracterização dos atributos diagnóstico, a oscilação do nível freático dos solos foi monitorada por meio de poços de observação de 2,5 m de profundidade, durante um ano. Os Latossolos estudados foram considerados semelhantes química e fisicamente. Contudo, diferiram quanto às caracterizações morfológica e mineralógica, com a presença de horizontes concrecionários e goethita nos LVA. A estabilidade da goethita nesses solos foi influenciada pela oscilação do lençol freático. Constatou-se menor condutividade hidráulica saturada e menor variação da profundidade freática nos LVA, em razão da deficiência de drenagem interna causada pela presença dos horizontes concrecionários. Os LVA apresentam, portanto, menor potencial agrícola que os LV, no Distrito Federal. As características físico-hídricas de Latossolos têm pouca influência sobre atributos diagnóstico, com exceção da mineralogia dos óxidos de ferro, que apresentam os teores de goethita aumentados em condições de baixa drenagem interna.Termos para indexação: concreções ferruginosas, condutividade hidráulica saturada, plintita, profundidade freática, regime hídrico. The internal drainage as a differentiation factor in Oxisols of Distrito Federal, BrazilAbstract -The objective of this work was to determine the influence of soil physicohydric characteristics on Oxisols diagnostic attributes. Morphological, chemical, physical, mineralogical and physicohydric attributes were surveyed in profiles of five Latossolos Vermelhos (Rhodic Haplustox, LV) and of five Latosssolos Vermelho-Amarelos (Typic Haplustox, LVA), considered representative of this kind of Oxisols in Distrito Federal, Brazil. Besides the soil diagnostic attributes characterization, the water-table oscillation was monitored using 2.5-m depth observation wells, during one year. The studied Oxisols were considered chemically and physically similar. However, they differed as to morphological and mineralogical characterization, with the presence of concretionary horizons and goethite in the LVA. Goethite stability in this soils was influenced by the water-table oscillation. The presence of concretionry horizons in LVA caused an internal drainage deficiency, which resulted in lower saturated hydraulic conductivity and lower variation of the water-table levels. Therefore, LVA soils show lower agricultural potential than LV ones, in Distrito Federal. Oxisols physicohydric characteristics have little influence on soil diagnostic attributes, except for iron oxides mineralogy, which show increased contents of goethite in low internal drainage conditions.

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“…This curve graphically represents the relationship between the energy of water retention (matric potential, in logarithmic scale) and water content, which is dependent on the intrinsic characteristics of each soil, the result of joint action of soil attributes such as texture, structure, mineralogy and organic carbon, in [4,19,37,40].…”

Section: Modeling the Water Retention Curve Of Oxidic Latosolsmentioning

confidence: 99%

“…Consequently, in these soils, the pore distribution by size is predominantly characterized by two distinct classes of pores: the first one is related to very large or structural pores (among micro-aggregates), which promote rapid internal drainage of the soil, however, they are very susceptible to alteration; and the second one is related to very small pores or textural pores (inside micro-aggregates), in which water is retained with very high energy, in [10,21,63]. This segregation of contrasting pores is typical of oxidic Latosols from this region, in which the increase of clay content is associated with higher total porosity and lower bulk density, in [31,37,46,72,88,89].…”

Section: Introductionmentioning

confidence: 99%