Soil Consistence: Effect of Particle Size

Ibanga, I. J.; Bidwell, O. W.; Powers, Wendy; Feyerherm, A. M.; Williams, Wayne W.

doi:10.2136/sssaj1980.03615995004400050049x

Cited by 10 publications

(5 citation statements)

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“…Another laboratory measure of soil cohesive strength is the modulus of rupture (MOR). Laboratory studies have found that MOR is mostly related to clay content (Ibanga et al , 1980). MIR gives a reasonable prediction of this tensile strength measurement where the soil has been remoulded (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Using soil knowledge for the evaluation of mid‐infrared diffuse reflectance spectroscopy for predicting soil physical and mechanical properties

Minasny

McBratney

Tranter

et al. 2008

European J Soil Science

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Mid-infrared diffuse reflectance spectroscopy can provide rapid, cheap and relatively accurate predictions for a number of soil properties. Most studies have found that it is possible to estimate chemical properties that are related to surface and solid material composition. This paper focuses on prediction of physical and mechanical properties, with emphasis on the elucidation of possible mechanisms of prediction. Soil physical properties that are based on pore-space relationships such as bulk density, water retention and hydraulic conductivity cannot be predicted well using MIR spectroscopy. Hydraulic conductivity was measured using a tension-disc permeameter, excluding the macropore effect, but MIR spectroscopy did not give a good prediction. Properties based on the soil solid composition and surfaces such as clay content and shrink-swell potential can be predicted reasonably well. Macro-aggregate stability in water can be predicted reasonably as it has a strong correlation with carbon content in the soil. We found that most of the physical and mechanical properties can be related back to the fundamental soil properties such as clay content, carbon content, cation exchange capacity and bulk density. These connections have been explored previously in pedotransfer functions studies. The concept of a spectral soil inference system is reiterated: linking the spectra to basic soil properties and connecting basic soil properties to other functional soil properties via pedotransfer functions.

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Section: Resultsmentioning

confidence: 99%

Using soil knowledge for the evaluation of mid‐infrared diffuse reflectance spectroscopy for predicting soil physical and mechanical properties

Minasny

McBratney

Tranter

et al. 2008

European J Soil Science

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“…They concluded that soil strength was directly related to the percentage of clay, less strongly so to the percentage of sand, and inversely related to the percentage of silt. Reanalysis of the data of Ibanga et al (1980) (Fig. 8) showed that s was strongly related to the silt/clay ratio.…”

Section: Discussionmentioning

confidence: 97%

“…Plot of the modulus of rupture, s , as a function of the silt/clay content ratio for the data set of Ibanga et al (1980) (solid circles) and the fitted expression (Eq. [17]) (solid line).…”

Section: Discussionmentioning

confidence: 99%

“…Soil strength is traditionally explained in terms of the absolute contents of the soil mechanical components rather than their ratios. Ibanga et al (1980) examined the effect of particle size on soil hardness of 17 artificial soil‐texture mixtures that comprised various combinations of dried sand, silt, and clay fractions, and calculated the modulus of rupture, s , of these mixtures according to Reeve (1965) They concluded that soil strength was directly related to the percentage of clay, less strongly so to the percentage of sand, and inversely related to the percentage of silt. Reanalysis of the data of Ibanga et al (1980) (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Modeling the Relationship between Soil Bulk Density and the Water Retention Curve

Assouline

2006

Vadose Zone Journal

123

138

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Increases in the soil bulk density during compaction may influence many aspects of the soil–water–plant–atmosphere system. An empirical approach is suggested that could model the effect of an increase in soil bulk density on the water retention curve (WRC). Two expressions of the WRC are considered. Relationships between their parameters and the bulk density of a compacted soil were calibrated and validated against experimental WRC data of soils at various levels of compaction. These relationships enable a relatively good prediction of the effect of bulk density on the WRC. The relationship between the pore size distribution index and the coefficient of variation of the WRC, previously found for a wide range of soil types, is appropriate also when soils at different bulk densities are considered. The silt/clay content ratio was found to be an important factor in a quantitative expression of soil strength.

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“…Drying may take several days depending on humidity and soil type. To get different rupture resistances of the fabricated peds, vary the mixture of a sandy and loamy soil, or sandy and silty‐clay loam soil (Ibanga et al, 1980). Some experimentation may be needed on the proportions of the different soils needed to get the desired rupture resistance.…”

Section: Fragmentsmentioning

confidence: 99%

Describing Soils: Calibration Tool for Teaching Soil Rupture Resistance

Seybold¹,

Harms²,

Grossman³

2009

Journal of Natural Resources and Life Sciences Education

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Rupture resistance is a measure of the strength of a soil to withstand an applied stress or resist deformation. In soil survey, during routine soil descriptions, rupture resistance is described for each horizon or layer in the soil profile. The lower portion of the rupture resistance classes are assigned based on rupture between thumb and forefinger. The tactile sense of the pressure can vary considerably between individuals. A calibration tool was developed, to help the students and soil scientists calibrate their thumb and forefinger for the correct amount of pressure. Instructions on how to assemble four pressure calibration tool assemblies measuring 8, 20, 40, and 80 N of applied pressure are presented. The calibration tools are demonstrated on how the combinations of spring/knobs are put together to get different rupture pressures. Manufactured or substitute fragments for natural fragments can be used in the instruction of rupture resistance in the classroom. In soil survey, this tool has been effective in calibrating the finger-force range for rupture resistance class placement for the last two decades.

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Soil Consistence: Effect of Particle Size

Cited by 10 publications

References 0 publications

Using soil knowledge for the evaluation of mid‐infrared diffuse reflectance spectroscopy for predicting soil physical and mechanical properties

Using soil knowledge for the evaluation of mid‐infrared diffuse reflectance spectroscopy for predicting soil physical and mechanical properties

Modeling the Relationship between Soil Bulk Density and the Water Retention Curve

Describing Soils: Calibration Tool for Teaching Soil Rupture Resistance

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