Linear Extensibility as Calculated from Natural‐Clod Bulk Density Measurements

Grossman, Robert B.; Brasher, B. R.; Franzmeier, D. P.; Walker, J. L.

doi:10.2136/sssaj1968.03615995003200040041x

Cited by 115 publications

(64 citation statements)

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“…The results indicated that profiles AH-05, AH-09, HN-03 and HN-10 showed high values of COLE in the sub-layers with high percentage of clay content and CEC. High COLE values are also found in other studies (Moustakas, 1990) and COLE value greater than 0.03 cm cm -1 suggests having a high amount of montmorillonite (Grossman et al, 1968). XRD analysis (Figs 3, 4) showed that all profiles of the soils of Northern China are composed of smectite (montmorillonite) and vermiculite, so we can say that the mineralogy of the soils was mainly responsible for the high values of COLE in our samples.…”

Section: Discussionsupporting

confidence: 84%

Physical properties of unproductive soils of Northern China

Malik¹,

Malik²,

Yu-Tong³

et al. 2014

International Agrophysics

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A b s t r a c t. The general characteristics: particle size distribution, pH, cation exchange capacity, organic matter content, total NPK, surface area; and physical properties: coefficient of linear extensibility, tensile strength, shear strength and cracking, were investigated in unproductive soils of Northern China. Principle component analysis showed that tensile strength, cohesion, cracking characteristics, clay content, cation exchange capacity and coefficient of linear extensibility were positively correlated with each other, whereas negatively correlated with angle of friction, indicating that these properties were subjected to clay % and smectite content. These correlations might be mainly responsible for low productivity (low yields) in Northern China.

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Section: Discussionsupporting

confidence: 84%

Physical properties of unproductive soils of Northern China

Malik¹,

Malik²,

Yu-Tong³

et al. 2014

International Agrophysics

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“…La deformación del suelo se estimó por medio del coeficiente de extensibilidad lineal (COEL) que permite establecer la variación unidimensional del volumen de suelo desde que este se encuentra saturado hasta que se seca (Grossman et al, 1968). Para determinar la contracción del volumen de suelo como consecuencia del secado (COELh) se uso la siguiente ecuación:…”

Section: Coeficiente De Extensibilidad Linealunclassified

“…Para determinar la deformación del suelo producto de la compactación (COEL m ) durante el ensayo de consolidación se modificó la ecuación propuesta por Grossman et al (1968) …”

Section: Coeficiente De Extensibilidad Linealunclassified

Efecto Del Cambio De Uso en La Estabilidad De La Estructura Y La Función De Los Poros De Un Andisol (Typic Hapludand) Del Sur De Chile

Dörner¹,

Dec

Peng

et al. 2009

R.C. Suelo Nutr. Veg.

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Volcanic soils in southern Chile cover approximately 60% of the arable land in the country. These soils are under a wide range of land uses from pristine systems to intensively used ones. The objective of this study was to determine the effect of the land use change on: i) the structural stability after external and internal forces, ii) the hydraulic conductivity and iii) its functional resilience. Disturbed and undisturbed soil samples were collected at 5, 20 and 40 cm depths in an Andisol (Typic Hapludand) under native forest (NF), 50 year old pasture (P50) and 1 year old pasture (P1). The water retention, shrinkage and consolidation curves, hydraulic conductivity (Ks), air permeability (Ka), organic carbon content (CO), soil texture and allophane contents were determined. The unsaturated hydraulic conductivity (Ku) was estimated according to van Genuchten (1980). Soil deformation indexes as a consequence of mechanical (COLEm) and hydraulic (COLE h ) stresses were calculated. The studied soil is subject to continuous changes in their structure as a consequence of mechanical and hydraulic stresses affecting the pore size distribution and its functionality. The magnitude of these changes decreased with the increasing intensity of the land use. The great shrinkage capacity of the soil may have consequences on its hydraulic behaviour depending on the drying intensity through the formation of cracks and preferential path flows. Finally, the soil pores are able to recover its functional integrity after compaction, which is strongly related to the presence of organic matter contents.Keywords: Andisol, structural properties, pore functions RESUMENLos suelos volcánicos del sur de Chile constituyen cerca del 60% del suelo arable del país. Estos suelos se encuentran bajo un amplio rango de usos desde sistemas prístinos hasta otros con un uso intensivo. El objetivo de este trabajo fue determinar el efecto del cambio de uso de suelo sobre: i) la estabilidad del suelo frente a presiones externas e internas; ii) la conductividad hidráulica y iii) su resiliencia funcional. Muestras disturbadas y no disturbadas de suelo fueron recolectadas a 5, 20, 40 cm de profundidad 190 Rev. Cienc. Suelo Nutr. / J. Soil. Sci. Plant Nutr. 9(3): 190-209 (2009)

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“…Franzmeier and Ross (1968) and McCormack and Wilding (1975) found that total clay gave the best correlation with COLE, while Anderson et al (1973) found that fine clay gave the highest correlation to the properties they investigated. Ross (1978) COLE was calculated as (Dbd/Db)r/3-1 (Grossman et al 1968 (Eltantawy and Amold 1973). The specific surface area of soils was computed from the surface area of coarse and fine clay fractions.…”

mentioning

confidence: 99%

Shrink-Swell Potential and Cracking in Clay Soils of Saskatchewan

Dasog¹,

Acton²,

Mermut³

et al. 1988

Can. J. Soil. Sci.

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potential and cracking in clay soils of Saskatchewan. Can. J. Soil Sci. 68:251-26O.Clay soils in Saskatchewan were studied to understand their shrink-swell potential, to identify soil properties that predict the coefficient oflinear extensibility (COLE), and to assess the extent of cracking during the growing season. The soils have medium to very high shrink-swell potential, which is related to the specific surface area associated with expandable clays. Because expandable clays in these soils are predominantly of fine clay size, COLE is reasonably well predicted from percent fine clay. The extent of cracking is estimated for some sites using an improved method of measurement.Limited data suggest that cracking intensity in native grassland is less than in cultivated sites and that, under wheat, it is more pronounced in subarid than in subhumid sites.

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Linear Extensibility as Calculated from Natural‐Clod Bulk Density Measurements

Cited by 115 publications

References 0 publications

Physical properties of unproductive soils of Northern China

Physical properties of unproductive soils of Northern China

Efecto Del Cambio De Uso en La Estabilidad De La Estructura Y La Función De Los Poros De Un Andisol (Typic Hapludand) Del Sur De Chile

Shrink-Swell Potential and Cracking in Clay Soils of Saskatchewan

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