Quantification of macropores and their impact on preferential solute transport

Singh, Priyanka

doi:10.31274/rtd-180813-7181

Cited by 2 publications

(3 citation statements)

References 21 publications

(36 reference statements)

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“…Then R reduces to one; therefore, no sorbing of solutes is taking place in the soil; and 6 represents the volumetric water content. As Singh (1989) pointed out from Genuchten and Wierenga (1986), the retardation factor (R) parameter becomes less than one onJy when a fraction of the liquid phase has some contribution during the transport process.…”

Section: Solution Transport Model Cde Modelmentioning

confidence: 99%

Quantification of Soil Physical Properties by Using X-Ray Computerized Tomography (CT) and Standard Laboratory (STD) Methods

Sanchez¹

2003

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Section: Solution Transport Model Cde Modelmentioning

confidence: 99%

Quantification of Soil Physical Properties by Using X-Ray Computerized Tomography (CT) and Standard Laboratory (STD) Methods

Sanchez¹

2003

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“…Then R reduces to one; therefore, no sorbing of solutes is taking place in the soil; and 8 represents the volumetric water content. As Singh (1989) pointed out from Genuchten and Wierenga (1986), the retardation factor (R) parameter becomes less than one only when a fraction of the liquid phase has some contribution during the transport process.…”

Section: Cde Modelmentioning

confidence: 97%

“…. (1985) and Singh (1989) used plaster of Paris at the edges of the soil columns to detect soil macropores. In the current stud y, soil columns were not covered using impregnated sources.…”

Section: Soil Column Selectionmentioning

confidence: 99%

Quantification of soil physical properties by using X-ray computerized tomography (CT) and standard laboratory (STD) methods

Sánchez

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The implementation of x-ray computerized tomography (CT) on agricultural soils has been used in this research to quantify soil physical properties to be compared with standard laboratory (STD) methods. The overall research objective was to more accurately quantify soil physical properties for long-term management systems. Two field studies were conducted at Iowa State University's Northeast Research and Demonstration Farm near Nashua, lA using two different soil management strategies. The first field study was conducted in 1999 using continuous com crop rotation for soil under chisel plow with no-till treatments. The second study was conducted in 2001 on soybean crop rotation for the same soil but under chisel plow and no-till practices with wheel track and no-wheel track compaction treatments induced by a tractor-manure wagon. In addition, saturated hydraulic (Ks) conductivity and the convection-dispersion (CDE) model were also applied using longterm soil management systems only during 2001. The results obtained for the 1999 field study revealed no significant differences between treatments and laboratory methods, but significant differences were found at deeper depths of the soil column for tillage treatments. The results for standard laboratory procedure versus CT method showed significant differences at deeper depths for the chisel plow treatment and at the second lower depth for no-till treatment for both laboratory methods. The macroporosity distribution experiment showed significant differences at the two lower depths between tillage practices. Bulk density and percent porosity had significant differences at the two lower depths of the soil column. The results obtained for the 2001 field study showed no significant differences between tillage practices and compaction practices for both laboratory methods, but significant differences between tillage practices with wheel track and no-wheel compaction treatments were found along the soil profile for both laboratory methods. The K 5 measurements and CDE parameters revealed no significant differences between tillages and treatments. In essence, the CT method and CDE model both proved to be useful methods to quantify macropores and estimate solute transport parameters, respectively. Breakthrough curves were generated to observe the initial and final breakthrough of solute response along the soil matrix. Quantification of soil physical properties by using X-ray computerized tomography

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Quantification of macropores and their impact on preferential solute transport

Cited by 2 publications

References 21 publications

Quantification of Soil Physical Properties by Using X-Ray Computerized Tomography (CT) and Standard Laboratory (STD) Methods

Quantification of Soil Physical Properties by Using X-Ray Computerized Tomography (CT) and Standard Laboratory (STD) Methods

Quantification of soil physical properties by using X-ray computerized tomography (CT) and standard laboratory (STD) methods

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