Modelos de capacidade de suporte de carga de um Latossolo Vermelho-amarelo sob diferentes usos e manejos

Pires, Bruno Silva; Dias, Moacir de Souza; Rocha, Wellington Willian; Araújo-Junior, Cezar Francisco; Carvalho, Rita de Cássia Ribeiro

doi:10.1590/s0100-06832012000200032

Cited by 24 publications

(27 citation statements)

References 14 publications

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“…Subsequently, they were saturated with distilled water for 48 h. Water-saturated samples were weighed and then balanced at tensions of 2, 6 (field capacity), 10 and 33 kPa. A water-holding capacity of 6 kPa was considered field capacity, in line with Reichardt (1988) and Pires et al (2012), who stated that soils in tropical regions, mainly in Oxisols with good permeability, the water-holding capacity should be 6 kPa. To balance the water-holding capacity, we used Richards' pressure plate apparatus described by (Embrapa, 1997).…”

Section: Methodsmentioning

confidence: 92%

“…Thirty-two undisturbed soil samples were randomly collected from each management system (0-5 cm deep) (32 samples × three systems). Under animal grazing, the main soil deformations occur in the surface layer (Pires et al, 2012) and under machine traffic, they appear initially in the surface and then subsurface layers. Thus, samples were collected from the 0-5-cm layer, due to animal grazing and for being a recently installed planting system.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, soil resistance to penetration was tested in undisturbed samples from the 0-5 cm layer. This soil depth was chosen in agreement with Pires et al (2012), due to animal trampling and recent traffic of agricultural machinery. The tests were performed as proposed by Dias Junior et al (2004); thus, undisturbed soil was sampled with an Uhland cylinder with rings with known volume.…”

Section: Methodsmentioning

confidence: 99%

“…According to Pires et al (2012), understanding the soil compressive behavior is of great importance because, from the physical point of view, it is the basis to choose the management that less affects the soil structure.…”

Section: Introductionmentioning

confidence: 99%

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Compressiblity and Penetrability of Latossolo Vermelho-Amarelo Distrófico (Oxisol) Under Varied Management Systems and Land Uses

Júnior

Rocha

Pires

et al. 2015

Rev. Bras. Ciênc. Solo

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Soil compaction is one of the main degradation causes, provoked by inappropriate agricultural practices that override the limitations of the soil physical properties. Preconsolidation pressure and penetration resistance have proved effective as alternative to assess and identify soil compaction. Based on the interpretation of these physico-mechanical parameters, compaction can be prevented with a better adjusted soil management. This study was performed to generate preconsolidation pressure and penetration resistance models for Latososlo Vermelho-Amarelo distrófico (Oxisol) under various managements and uses; and evaluate which of these would lead to degradation or degradation susceptibility. The study was carried out in Curvelo, MG. Two managements and one land use were evaluated: no-tillage, sheep grazing and natural forest. Undisturbed soil samples collected from the 0-5 cm layer were subjected to uniaxial compression and penetration resistance tests. Preconsolidation pressure models for forest and no-tillage soils were not statistically different, demonstrating a low degradation potential in no-tillage systems. Preconsolidation pressure was higher in soil under sheep grazing at all water retention tensions and penetration resistance values were higher than under native forest indicating animal trampling as a potential degradation factor. Neither management presented penetration resistance values above 2 MPa at field

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Section: Methodsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compressiblity and Penetrability of Latossolo Vermelho-Amarelo Distrófico (Oxisol) Under Varied Management Systems and Land Uses

Júnior

Rocha

Pires

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Na última década, com o avanço da agricultura e das técnicas de precisão, o emprego de máquinas e implementos modernos, mais potentes e pesados, têm levado técnicos e pesquisadores da ciência do solo a desenvolver novos métodos de análise, assim como propor a inclusão de atributos mecânicos e dinâmicos em estudos de avaliação da estrutura dos solos agrícolas (Dias Júnior e Pierce, 1995;Peng et al, 2004;Araujo-Junior et al, 2008;Silva et al, 2010;Pais et al, 2011;Iori et al, 2012a;Pires et al, 2012). Iniciativas como essas têm feito da modelagem e da predição da Capacidade de Suporte de Carga do Solo (CSCS) uma proposta viável e exequível, mesmo que ainda praticada por um grupo restrito de pesquisadores no Brasil (Silva et al, 2003a;Severiano et al, 2008;Iori et al, 2013;Dias Júnior et al, 2005;Araujo-Junior et al, 2011;Pais et al, 2013).…”

Section: Introductionunclassified

Desenvolvimento, Automação E Desempenho De Um Consolidômetro Com Interface Homem-Máquina

Silva

Masqueto

Lanças

et al. 2015

Rev. Bras. Ciênc. Solo

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RESUMOO ensaio de consolidação preconiza a utilização de um consolidômetro. Esse equipamento, até então, não era produzido e comercializado no Brasil. Os modelos não automatizados disponíveis para importação, apesar da proposta de baixo custo, ainda são rústicos e necessitam de contínua calibração dos níveis de pressão durante a realização do ensaio. A exclusividade e intervenção de um técnico durante todo o ensaio, associada à precária coleta de dados nesses modelos, ainda são os principais fatores que têm inviabilizado a consolidação desse ensaio na ciência do solo brasileira. Como alternativa a esses problemas, este trabalho teve por objetivos desenvolver e automatizar um consolidômetro a partir de um Controlador Lógico Programável (CLP) com interface homem-máquina (IHM). O equipamento é constituído de um gabinete de metal que aloja conjuntos de dispositivos pneumáticos, eletrônico-digital e atuadores de força e posição. O funcionamento de cada dispositivo de forma isolado ou conjugado é gerenciado por meio de um software em linguagem de programação ladder, que, a partir de um CLP com IHM incorporada, possibilita armazenar instruções e implementar funções. A interface entre o PC e o consolidômetro é feita pelo software CA-Linker, v 1.0, projetado especificamente para o equipamento. O uso do CLP com IHM incorporada permitiu o desenvolvimento e a automação do consolidômetro. O desempenho e a eficiência do conjunto de dispositivos (pneumáticos, eletrônico-digital e atuadores de força e pressão) foram comprovados pelos excelentes resultados dos valores de deformação e pressão obtidos em função do tempo e, principalmente, do comportamento da curva de compressão, gerada pelos ensaios de compressão.Palavras-chave: compressibilidade do solo, Controlador Lógico Programável, ensaio de compressão uniaxial, pressão de pré-consolidação.Recebido para publicação em 18 de julho de 2014 e aprovado em 23 de dezembro de 2014.

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Soil compaction caused by harvesting, skidding and wood processing in eucalyptus forests on coarse‐textured tropical soils

Tassinari¹,

Andrade²,

Dias³

et al. 2019

Soil Use and Management

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Eucalyptus forests play a major role in the world economy, providing raw materials for different purposes. In planted forests, harvest operations performed by heavy machinery may cause severe soil compaction. This study aimed to evaluate the impact of a full‐tree harvesting system in planted eucalyptus forests from Northeastern Brazil. Different soils were evaluated (two Hapludults and one Haplorthod) in two horizons (BA and Bt). We tested different equipment, namely feller buncher, skidder (with traffic intensities of 3, 6, 12 and 16 passes), flail (at different ground‐contact points), grapple saw and loader. The soil physical attributes reflected not only the impact of equipment traffic but also the intrinsic differences between the soils. Bulk density (ranging from 1.36 to 1.80 t m−3 after trafficking) related well to soil class and horizon. Precompression stress (ranging from 203 to 430 kPa) and degree of compaction (76%–94%) following trafficking were well correlated, while increase in bulk density (reaching a maximum of 20%) related more strongly to soil moisture. A contingency table was constructed with the number of compacted samples and further examined by correspondence analysis. Compaction varied according to soil, horizon and equipment, indicating that machine–soil interactions are very specific and demand detailed research under different conditions. The Haplorthod experienced the greatest amount of compaction, whereas the Hapludult‐2 was more resistant (60% and 25% of compacted samples, respectively). The grapple saw and the skidder at higher traffic intensities (12 and 16 passes) exerted the highest mechanical impacts (81% and 67% of compacted samples, respectively).

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Modelos de capacidade de suporte de carga de um Latossolo Vermelho-amarelo sob diferentes usos e manejos

Cited by 24 publications

References 14 publications

Compressiblity and Penetrability of Latossolo Vermelho-Amarelo Distrófico (Oxisol) Under Varied Management Systems and Land Uses

Compressiblity and Penetrability of Latossolo Vermelho-Amarelo Distrófico (Oxisol) Under Varied Management Systems and Land Uses

Desenvolvimento, Automação E Desempenho De Um Consolidômetro Com Interface Homem-Máquina

Soil compaction caused by harvesting, skidding and wood processing in eucalyptus forests on coarse‐textured tropical soils

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