Micromorphology and image analysis of a hardsetting Ultisol (Argissolo) in the state of Ceará (Brazil)

Lima, Herdjânia Veras de; Silva, A.P.; Santos, M. C. D.; Cooper, Miguel; Romero, Ricardo Espíndola

doi:10.1016/j.geoderma.2005.06.006

Cited by 25 publications

(15 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example, larger contents of fine sand (27%) and very fine sand (36%) in the 0.0-0.2-m layer of Neossolos Quartzarênicos, in the state of Rio Grande do Sul, favor the formation of surface sealing (Scopel et al, 2012). Moreover, some light soils, particularly with medium texture and predominantly kaolinite clay fraction, have a higher cohesion than other oxidic ones, consequently showing hard to extremely hard consistency when dry and friability when wet (Fontana et al, 2016), a behavior similar to that found in the "Barreiras" sediment formation (Moreau, 2001;Lima et al, 2006;Giarola et al, 2009).…”

Section: Characterization Of Light Soilsmentioning

confidence: 89%

Characterization, agricultural potential, and perspectives for the management of light soils in Brazil

Donagemma

Freitas

Balieiro

et al. 2016

Pesq. agropec. bras.

View full text Add to dashboard Cite

-Light soils occupy 8% of the Brazilian territory and are especially expressive in the new and last agricultural frontier in Brazil: the Matopiba region -in the states of Maranhão, Tocantins, Piauí, and Bahia -, where they represent 20% of the area. These soils fit into the textural classes of sand and loamy sand or sandy loam, down to 0.75-m soil depth or deeper, and they are mainly represented by Neossolos Quartzarênicos (Quartzipsamments) and, partly, by Latossolos (Oxisols) and Argissolos (Ultisols). The understanding of soil functioning depends on the establishment of distinguishing criteria for: organic matter dynamics; content and mineralogy of the clay fraction; coarse sand and total sand contents, in relation to those of fine sand; mean diameter of the sand fraction; and water retention capacity. These criteria can contribute for the zoning and for the conservation and fertility management of light soils, as well as for the estimation of their agricultural potential. Integrated production systems, such as crop-livestock and crop-livestock-forestry integration, besides no-tillage with crop rotation, mixed forestry planting with legumes, and the use of green manure and cover crops are relevant for the proper management of these soils. The objective of this review was to characterize light soils and to highlight the main challenges regarding their agricultural potential and their conservation and fertility managements, in face of the expansion and consolidation of the new Brazilian agricultural frontier.

show abstract

Section: Characterization Of Light Soilsmentioning

confidence: 89%

Characterization, agricultural potential, and perspectives for the management of light soils in Brazil

Donagemma

Freitas

Balieiro

et al. 2016

Pesq. agropec. bras.

View full text Add to dashboard Cite

show abstract

“…Os horizontes adensados (coesos) apresentam grãos de quartzo dominando o esqueleto, envoltos por um plasma caulinítico denso e contínuo, com pouca tendência ao desenvolvimento de microestrutura (Giarola et al, 2001;Giarola, 2002;Lima et al, 2006). O modelo caulinítico normalmente implica em desenvolvimento de uma macroestrutura do tipo de bloco e pode originar solos com densidade mais elevada, maior proporção de poros pequenos e menor permeabilidade, em razão do ajuste face a face das placas dos minerais da fração argila (Ferreira et al, 1999a).…”

Section: Introductionunclassified

Mineralogia e cristalografia da fração argila de horizontes coesos de solos nos tabuleiros costeiros

Giarola

Lima

Romero

et al. 2009

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

(6) RESUMO A coesão de horizontes de solos do Brasil vem sendo associada, principalmente, a fatores físicos e químicos inter-relacionados, mas a influência das propriedades mineralógicas e cristalográficas dos minerais da fração argila também foi aventada por alguns pesquisadores. Neste trabalho, testou-se a hipótese de que a fração argila de horizontes coesos de solos do Sedimento Barreiras da faixa dos Tabuleiros Costeiros é dominantemente caulinítica e apresenta elevado grau de cristalinidade e ordenamento, o que pode favorecer o ajuste face a face dos cristais. O objetivo deste trabalho foi avaliar as características mineralógicas e cristalográficas dos minerais da fração argila de horizontes coesos provenientes de solos de sedimentos do Grupo Barreiras e uma possível contribuição para a ocorrência do caráter coeso. Para isso, foram analisados cinco horizontes coesos e um não-coeso de solos distribuídos ao longo da faixa dos Tabuleiros Costeiros. Também foi incluída, como referência, uma caulinita com elevado grau de cristalinidade. Todos os perfis foram analisados para classificação taxonômica e localização dos horizontes de interesse. Nas amostras dos horizontes selecionados, foram removidos a matéria orgânica e os óxidos. Após a dispersão de partículas, a fração argila foi individualizada, tratada e analisada por difração de raios X (DRX) para determinar os minerais e o grau de ordem/desordem estrutural, segundo o Método Especialista de Plançon & Zacharie (1990). Todos os horizontes coesos apresentaram caulinitas

show abstract

“…During the analysis pores were separated according to their shape and size. Soil pores were divided into three shape classes (rounded, elongated, and irregular) characterized using two indexes and thresholds (Lima et al 2006, Cooper et al 2005. Pores of each shape group were subdivided into three different size classes (20-50; 50-500; and > 500 μm).…”

Section: Methodsmentioning

confidence: 99%

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis

Pires

Reichardt²,

Cooper³

et al. 2009

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which samples were not submitted to any W-D cycle; 3WD and 9WD with samples submitted to 3 and 9 consecutive W-D cycles, respectively. It was observed that W-D cycles produced significant changes in large irregular pores of the GF and RF soils, and in rounded pores of the EN soil. Nevertheless, important changes in smaller pores (35, 75, and 150 μm) were also observed for all soils. As an overall consideration, it can be said that the use of image analysis helped to explain important changes in soil pore systems (shape, number, and size distribution) as consequence of W-D cycles.

show abstract

Micromorphology and image analysis of a hardsetting Ultisol (Argissolo) in the state of Ceará (Brazil)

Cited by 25 publications

References 23 publications

Characterization, agricultural potential, and perspectives for the management of light soils in Brazil

Characterization, agricultural potential, and perspectives for the management of light soils in Brazil

Mineralogia e cristalografia da fração argila de horizontes coesos de solos nos tabuleiros costeiros

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis

Contact Info

Product

Resources

About