Desenvolvimento de um consolidômetro pneumático: modelagem da compactação, penetrometria e resistência tênsil de agregados de solo

Figueiredo, Getúlio Coutinho; Silva, Álvaro Pires da; Tormena, Cássio Antônio; Giarola, Neyde Fabíola Balarezo; Moraes, Sérgio Oliveira; Almeida, Brivaldo Gomes de

doi:10.1590/s0100-06832011000200009

Cited by 20 publications

(5 citation statements)

References 46 publications

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“…Depois de atingido o equilíbrio das amostras em cada potencial mátrico, foi determinada a massa úmida das amostras. Posteriormente a resistência à penetração foi medida com auxílio de um penetrômetro eletrônico de bancada, montado e desenvolvido no Departamento de Ciência do Solo da ESALQ/USP por Figueiredo et al (2011). As medidas de resistência foram realizadas no centro de cada amostra, a haste de aço com extremidade cônica (ângulo de 60º e diâmetro basal de 0,4 cm) foi introduzida, a uma velocidade nominal de 10 mm min -1 , até 4,0 cm da superfície superior de cada amostra de solo.…”

Section: Methodsunclassified

Alterações na qualidade física de um latossolo amarelo sob pastagem

2014

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Indicadores de qualidade física do solo representam uma importante ferramenta no estudo das alterações que ocorrem no solo em função de ações de uso e manejo. Objetivou-se com este estudo utilizar o intervalo hídrico ótimo (IHO) e o índice-S (declividade da curva de retenção de água no solo no ponto de inflexão) para quantificar as alterações físicas do solo promovidas pelo sistema de pastagem, tendo como referência um solo sob mata. O estudo foi realizado em um Latossolo Amarelo distroférrico típico sob mata nativa e pastagem, onde foram coletadas amostras deformadas e indeformadas nas profundidades de 0-5 e 25-30 cm, utilizadas para determinação do carbono orgânico do solo e análises físicas. Os valores de índice-S, com exceção do solo sob mata (0-5 cm), estiveram abaixo do limite sugerido para separar solos com boa e pobre qualidade estrutural. O IHO foi fortemente reduzido no solo sob pastagem, chegando a atingir valor zero. O principal fator limitante para a disponibilidade de água foi a resistência à penetração, que exceto em mata (0-5 cm), atuou como limite inferior do IHO em todas as áreas e profundidades avaliadas. Os indicadores de qualidade física do solo, IHO e índice-S, apresentaram conformidade quanto à avaliação da qualidade física dos solos estudados e indicaram as alterações físicas promovidas no solo sob sistema de pastagem.

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Section: Methodsunclassified

Alterações na qualidade física de um latossolo amarelo sob pastagem

2014

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“…The susceptibility of soils to compaction and the extent of soil compaction can be evaluated with different properties of the soil, such as bulk density, porosity, penetration resistance, hydraulic conductivity (Ampoorter et al, 2010;Silva et al, 2011;Moreira et al, 2012;Braga et al, 2013;Lopes et al, 2015;Silva et al, 2016), and more recently, the precompression stress (Araujo-Junior et al, 2011;Figueiredo et al, 2011;Pacheco;Cantalice, 2011;Ajayi et al, 2013). Precompression stress is generally considered as (a) an indicator of the soil mechanical strength (Ajayi et al, 2013); (b) the maximum pressure that should be applied to the soil to prevent compaction (Severiano et al, 2010;Araujo-Junior et al, 2011), and (c) the required pressure by the root system to enable the root elongation (Iori et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

et al. 2018

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Traffic of farm machinery during harvest and logging operations has been identified as the main source of soil structure degradation in forestry activity. Soil susceptibility to compaction and the amount of compaction caused by each forest harvest operation differs according to a number of factors (such as soil strength, soil texture, kind of equipment, traffic intensity, among many others), what requires the adequate assessment of soil compaction under different traffic conditions. The objectives of this study were to determine the susceptibility to compaction of five soil classes with different textures under eucalyptus forests based on their load bearing capacity models; and to determine, from these models and the precompression stresses obtained after harvest operations, the effect of traffic intensity with different equipment in the occurrence of soil compaction. Undisturbed soil samples were collected before and after harvest operations, being then subjected to uniaxial compression tests to determine their precompression stress. The coarse-textured soils were less resistant and endured greater soil compaction. In the clayey LVd2, traffic intensity below four Forwarder passes limited compaction to a third of the samples, whereas in the sandy loam PVd all samples from the 0-3 cm layer were compacted regardless of traffic intensity. The Feller Buncher and the Clambunk presented a high potential to cause soil compaction even with only one or two passes. The use of soil load bearing capacity models and precompression stress determined after harvest and logging operations allowed insight into the soil compaction process in forestry soils.

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“…The uniaxial compaction test was performed with a pneumatic consolidometer, described by Figueiredo et al (2011). Successive and continuous applications of increasing loads of 0, 12.5, 25, 50, 100, 200, 400, 600, 800, 1000, and 1200 kPa were applied to the samples for a period of five minutes (Silva et al, 2000).…”

Section: Uniaxial Compaction Testmentioning

confidence: 99%

“…This reduces soil resistance to compaction in the upper layers (Silva et al, 2002a;Figueiredo et al, 2011) and increases the depth reached by stresses applied to the soil by machine traffic, making it more susceptible to compaction at deeper layers (Arvidsson, 2001;Alakukku et al, 2003); this explains the higher values for σ p and ρ at the layer of 0.20-0.30 m.…”

Section: Preconsolidation Pressure and Compression Indexmentioning

confidence: 99%

Soil Compressibility under Irrigated Perennial and Annual Crops in a Semi-Arid Environment

Watanabe

Figueiredo

Silva

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:In irrigated soils, a continuous state of high moisture reduces resistance of the soil to applied external forces, favouring compaction. The aim of this study was to evaluate the susceptibility to compaction of developed calcareous soils in irrigated annual and perennial cropping systems of the Apodi Plateau, located in the Brazilian semi-arid region. Four areas of irrigated crops were evaluated: banana after two (B2) and 15 (B15) years cultivation, pasture (P), and a corn and beans succession (MB), as well as the reference areas for soil quality and corresponding natural vegetation (NVB2, NVB15, NVP and NVMB). Samples were collected at layers of 0.00-0.10 and 0.20-0.30 m; and for B2 and B15, samples were collected in the row and inter-row spaces. The following properties were determined: degree of compactness (DC), preconsolidation pressure (σ p ), compression index (Cc), maximum density (ρ max ), critical water content (WC crit ), total organic carbon (TOC) and carbon of light organic matter (C lom ). Mean values were compared by the t-test at 5, 10, 15 and 20 % probability. An increase was seen in DC at a layer of 0.20-0.30 m in MB (p<0.15), showing the deleterious effects of preparing the soil by ploughing and chiselling, together with the cumulative traffic of heavy machinery. The TOC had a greater influence on ρ max than the stocks of C lom . Irrigation caused a reduction in Cc, and there was no effect on σ p at field capacity. The planting rows showed different behaviour for Cc, ρ max , and WC crit, , and in general the physical properties displayed better conditions than the inter-row spaces. Values for σ p and Cc showed that agricultural soils display greater load-bearing capacity and are less susceptible to compaction in relation to soils under natural vegetation.

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Desenvolvimento de um consolidômetro pneumático: modelagem da compactação, penetrometria e resistência tênsil de agregados de solo

Cited by 20 publications

References 46 publications

Alterações na qualidade física de um latossolo amarelo sob pastagem

Alterações na qualidade física de um latossolo amarelo sob pastagem

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

Soil Compressibility under Irrigated Perennial and Annual Crops in a Semi-Arid Environment

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