Estimation of the van Genuchten Soil Water Retention Properties from Soil Textural Data

Ghanbarian-Alavijeh, Behzad; Liaghat, Abdolmajid; Huang, Guanhua; Genuchten, Martinus Th. van

doi:10.1016/s1002-0160(10)60035-5

Cited by 140 publications

(59 citation statements)

References 39 publications

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“…The values of FC and PWP is found at pressures between 0.3 and 15 bar, according to the methodology described by PIRES et al (2005).The curves found have typical behavior of loam soil in accordance with studies from GHANBARIAN-ALAVIJEH et al (2010).The values of field capacity range from 0.32 to 0.55 cm 3 cm -3 , which is higher on the P2 surface. These values agree with the above by MEZA & GEISSERT (2003) for andic soils.…”

Section: Resultssupporting

confidence: 74%

Changes in water availability in the soil due to tractor traffic

2013

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Frequent traffic of tractors in agricultural soils, promotes soil compaction and affects the flow and water availability. The aim of this research was to study the effect of compaction induced by tractor traffic on water availability in the soil under different traffic intensities on the same path (0, 1, 3, 6 and 10 passages), to two tractors with 3.3 and 2.6 ton of weights, over three different surface conditions. The study was conducted in an Andisol, representative soil of the study area. It was determined the behavior of the water retention curve, obtaining the gravitational water, available water and hygroscopic water, to 10 and 30 cm of depth. The hygroscopic water is the most prevalent with values of up to 80% of the total water present in the soil. The water retention curves showed increases in the values of field capacity and wilting point and behaviors "flattened" indicating a high sensitivity to the applied treatments, representative of compacted soils, which give the surfaces studied characteristics do not suitable for normal crop development.KEYWORDS: compaction, soil management, water retention curve, Andisol. MUDANÇAS NA DISPONIBILIDADE DE ÁGUA DO SOLO DEVIDO AO TRÁFEGO DE TRATORESRESUMO: O tráfego frequente de tratores em solos agrícolas favorece a compactação dos solos e afeta o fluxo e a disponibilidade da água. O objetivo do presente trabalho foi estudar o efeito da compactação induzida pelo tráfego do trator na disponibilidade de água do solo, sob diferentes intensidades de trânsito sobre o mesmo caminho (0, 1, 3, 6 e 10 passadas), para dois tratores com pesos de 3,3 e 2,6 ton, em três condições de superfície diferentes. O estudo foi desenvolvido em um Andisol, solo representativo da zona estudada. Determinou-se o comportamento da curva de retenção de umidade, obtendo-se a água gravitacional, a água disponível e água higroscópica, a profundidades de 10 e 30 cm. Encontrou-se uma predominância da água higroscópica com valores de até 80% da água total presente no solo. As curvas de retenção de umidade apresentaram incrementos nos valores de capacidade de campo e ponto de murchamento permanente e com comportamentos "achatados" indicando uma alta sensibilidade aos tratamentos aplicados, representativa de solos compactados, o qual confere às superfícies estudadas características não aptas para o desenvolvimento normal de culturas.PALAVRAS CHAVE: compactação, manejo de solos, curva de retenção de água, Andisol.

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Section: Resultssupporting

confidence: 74%

Changes in water availability in the soil due to tractor traffic

2013

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“…While some mixing of soil horizons can occur during upland forest site preparation that includes piling (Gent et al, 1984;Hoadley, 2014), the influence on particle size distribution within the profile is small compared to the influence on macroporosity. When macropores are created by tillage, the soil water release curve (soil water content plotted against soil water potential) is shifted, but the curve shape is largely retained since particle size distribution, which largely controls the shape of the water retention curve (Ghanbarian-Alavijeh et al, 2010;Zhuang et al, 2001), is not greatly affected. In this study, water availability on a unit volume basis was reduced, but improved rooting conditions that apparently increased root penetration and the volume of soil utilized compensated for the lower availability on a unit volume basis.…”

Section: Discussionmentioning

confidence: 99%

Loblolly Pine (Pinus taeda L.) Seedling Growth Response to Site Preparation Tillage on Upland Sites

Furtado¹,

Morris

Markewitz

2016

Soil Science Society of America Journal

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T he southeastern United States is the world's largest industrial wood producer, with approximately 16 million hectares of industrial pine timberland (Prestemon and Abt, 2002;Haynes, 2002;Smith et al., 2004). Wood demand from this region is expected to increase, and the land base dedicated to silvicultural practices is expected to continue to shift from natural forests owned by nonindustrial private landowners to pine plantations (Allen et al., 2005). Thus, the role of intensive forest management to maintain and increase wood production is increasing in significance (Borders and Bailey, 2001;Fox, 2000;Martin and Shiver, 2002).Since the 1950s, mechanical site preparation has been considered essential to southern pine plantation management (Martin and Shiver, 2002 • Growth responses to tillage occur across fertilization and competition control treatments.• Tree size was not well predicted by mean soil resistance.• Soil resistance in the 0-to 0.15-m depth increment delineated an upper bound for tree size two years after planting.

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“…É importante destacar que o conhecimento da magnitude da variabilidade espacial dos parâmetros estudados é essencial para utilização em modelos de simulação de fluxo de água em solos e de predição das relações e do comportamento do sistema solo-planta-atmosfera, uma vez que tais modelos utilizam tais parâmetros como dados de entrada (GHANBARIAN-ALAVIJEH et al, 2010;DETTMANN et al, 2014).…”

Section: Resultsunclassified

Variabilidade espacial dos parâmetros da equação de van Genuchten em um Latossolo Vermelho-Amarelo

Mota

Libardi

Brito

et al. 2017

AGRO@MBIENTE ON-LINE

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Resumo: O conhecimento da variabilidade espacial dos parâmetros da equação de van Genuchten é importante para a interpretação de determinados indicadores de qualidade física do solo, uma vez que alguns índices derivam da curva característica da água no solo. Partindo da hipótese de que mesmo em área considerada homogênea há variabilidade espacial distinta para os parâmetros dessa equação, objetivou-se com o presente trabalho avaliar a variabilidade espacial dos parâmetros θs, θr, α, m e n em Latossolo VermelhoAmarelo. Para esse estudo, estabeleceram-se 60 pontos de amostragem, distanciados 5 m entre si, em uma grade de 10 x 6 pontos (50 x 30 m). Foram coletadas amostras de solo com estrutura preservada em anéis de aço com dimensões de 0,05 m de altura e diâmetro, em cinco repetições na profundidade de 0,80 m, totalizando 300 amostras. Foram avaliados os atributos granulometria, densidade das partículas, densidade do solo e curva característica de água no solo. A curva foi construída considerando as tensões 1, 2, 3, 4, 5, 6, 7, 8, 9 e 10 kPa (no funil de Haines) e 30, 50, 70 e 100 kPa (no extrator de placa porosa de Richards). Os dados foram ajustados ao modelo de van Genuchten (1980) com o programa Table Curve 2D, versão trial 5.01, inclusive para a extrapolação da umidade residual. Os parâmetros da equação de van Genuchten foram analisados quanto à variabilidade espacial com uso da técnica da diferença relativa. Concluiu-se que apesar da uniformidade na textura e na densidade do solo, os parâmetros da equação de van Genuchten variam espacialmente de modo que não há um ponto amostral único que represente o valor médio de θs, θr, α, m e n.Palavras-chave: Curva característica de água no solo. Amostragem de solo. Agricultura de precisão. Abstract:The knowledge of the spatial variability of the van Genuchten equation parameters is important for the interpretation of certain indicators of soil physical quality, since some indices derived from the soil water retention curve. Assuming that even in considered homogeneous area there is different spatial variability of parameters of this equation, aimed evaluate the spatial variability of parameters θs, θr, α, m and n in a Latossolo Vermelho-Amarelo. For this study were established 60 sampling points with distance apart of five meters, in a grid of 10 x 6 points (50 x 30 m). Soil samples were collected with preserved structure, in steel rings with dimensions of 0.05 m high and 0.05 m in diameter, with five replicates collected at a depth of 0.80 m, totaling 300 samples. Was evaluated the attributes grain size, particle density, soil bulk density and soil water retention curve. The soil water retention curve was constructed considering the points 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 kPa (in the Haines funnel) and 30, 50, 70 and 100 kPa (in the Richards extractor). The data were adjusted to the van Genuchten model (1980) with the program Table Curve 2D, trial version 5.01, including for extrapolation of residual moisture. The parameters of the van Genuchten equation were analy...

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Estimation of the van Genuchten Soil Water Retention Properties from Soil Textural Data

Cited by 140 publications

References 39 publications

Changes in water availability in the soil due to tractor traffic

Changes in water availability in the soil due to tractor traffic

Loblolly Pine (Pinus taeda L.) Seedling Growth Response to Site Preparation Tillage on Upland Sites

Variabilidade espacial dos parâmetros da equação de van Genuchten em um Latossolo Vermelho-Amarelo

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