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| Vendrame,Pedro Rodolfo Siqueira; Marchão,Robélio Leandro; Brito,Osmar Rodrigues; Guimarães,Maria de Fátima; Becquer,Thierry. |
| The objective of this work was to assess the relationship between macrofauna, mineralogy and exchangeable calcium and magnesium in Cerrado Oxisols under pasture. Twelve collection points were chosen in the Distrito Federal and in Formosa municipality, Goiás state, Brazil, representing four soil groups with varied levels of calcium + magnesium and kaolinite/(kaolinite + gibbsite) ratios. Soil macrofauna was collected in triplicate at each collection point, and identified at the level of taxonomic groups. Macrofauna density showed correlation with contents of kaolinite, gibbsite and exchangeable Ca + Mg in the soils. Mineralogy and exchangeable Ca + Mg had significant effects on taxonomic groups and relative density of soil macrofauna. The termites... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gibbsite; Kaolinite; Soil fauna; Soil fertility; Total carbon. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800031 |
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| Testoni,Samara Alves; Melo,Vander Freitas; Dawson,Lorna Anne; Salvador,Fábio Augusto da Silva; Kunii,Paulo Akira. |
| ABSTRACT Soil traces are useful as forensic evidence due to their potential to transfer and adhere to different types of surfaces on a range of objects or persons. Several works have been developed in forensic soils, under different analytical approaches. However, in Brazil, only the researches from the Group of the Federal University of Paraná have developed works with soils under a forensic approach. Focus has been given on the sequential chemical analyses and mineralogical techniques once they presented a large potential to discriminate soil samples, even that originated from the same bedrock. In this way, this work aimed to test a Standard Operating Procedure (SOP) for forensic soil sampling and an analytical protocol in Brazil between the academy and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forensic science; Soil evidence; Sequential chemical analysis; Gibbsite; Iron oxides. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100410 |
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| Camargo,Livia Arantes; Marques Júnior,José; Pereira,Gener Tadeu. |
| A good knowledge of the spatial distribution of clay minerals in the landscape facilitates the understanding of the influence of relief on the content and crystallographic attributes of soil minerals such as goethite, hematite, kaolinite and gibbsite. This study aimed at describing the relationships between the mineral properties of the clay fraction and landscape shapes by determining the mineral properties of goethite, hematite, kaolinite and gibbsite, and assessing their dependence and spatial variability, in two slope curvatures. To this end, two 100 × 100 m grids were used to establish a total of 121 regularly spaced georeferenced sampling nodes 10 m apart. Samples were collected from the layer 0.0-0.2 m and analysed for iron oxides, and kaolinite and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Iron oxides; Kaolinite; Gibbsite; Goethite; Hematite; Relief. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200001 |
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| Fink, Jessé Rodrigo; Universidade Federal do Rio Grande do Sul; Inda, Alberto Vasconcellos; Universidade Federal do Rio Grande do Sul; Bayer, Cimélio; Universidade Federal do Rio Grande do Sul; Torrent, José; Universidade de Córdoba; Barrón, Vidal; Universidade de Córdoba. |
| The low phosphorus availability in tropical and subtropical soils, normally related to adsorption of phosphate to the minerals surfaces, can be attenuated when organic matter (OM) accumulates in the soils. Herein, we report the results of long-term experiments (18–32 years) aimed at quantifying the maximum phosphorus adsorption capacity (MPAC) and its determinant mineralogical variables in Brazilian soils and at assessing the effect of no-tillage (NT) in mitigating the phosphorus adsorption of soils. The MPAC of soils ranged from 297 to 4,561 mg kg-1 in the 0.00–0.10 m layer and from 285 to 4,961 mg kg-1 in the 0.10–0.20 m layer. The MPAC was correlated with the concentrations of iron oxides, goethite and ferrihydrite, gibbsite/(gibbsite+kaolinite) ratio... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.01.00-5; 5.01.01.05-6; 5.01.01.01-3 iron oxides; Gibbsite; Organic carbon; Phosphate Fertilidade do solo; Gênese do solo; Manejo do solo. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17937 |
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