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Use of Clay Dispersed in Water for Decreasing Soil Water Repellency : Water Repellency Mitigation
, 2017 In this study, we examined the efficiency of a kaolinite clayey soil to mitigate water repellency of a sandy soil with olive trees. The treatment was applied to the soil zone below the tree canopy, which displayed the highest degree of water repellency [average water drop penetration time (WDPT) value = 820 s]. Both dry (incorporated onto the top soil)
Diamantis, Vasileios +8 more
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Fungi in century old managed soils could hold key to the development of soil water repellency
Soil Biology and Biochemistry, 2012 We examined the impact of fungi, using the biomarkers glomalin and ergosterol, on the influence of water repellency on 15 land management treatments, sourced from century old managed arable and grassland sites. We observed strong and significant positive
Iain M Young +2 more
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Soil Science Society of America Journal, 2002
Adverse effects of soil water repellency (hydrophobicity) are of concern during or following rainfall or irrigation, and are often preceded by conditions of high atmospheric relative humidity (RH). Assessments of repellency are, however, commonly conducted on air‐dried samples at ambient laboratory conditions.
S. H. Doerr +4 more
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Adverse effects of soil water repellency (hydrophobicity) are of concern during or following rainfall or irrigation, and are often preceded by conditions of high atmospheric relative humidity (RH). Assessments of repellency are, however, commonly conducted on air‐dried samples at ambient laboratory conditions.
S. H. Doerr +4 more
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Geoderma, 2014
Abstract Soil water repellency (SWR) causes reduced soil water storage and enhanced runoff and reduced ecosystem productivity. As such, characterization of SWR is a prerequisite for effective environmental management. The objectives of this study were to determine the relationship between the severity of SWR and its persistence and to determine the ...
Chau, Henry +3 more
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Abstract Soil water repellency (SWR) causes reduced soil water storage and enhanced runoff and reduced ecosystem productivity. As such, characterization of SWR is a prerequisite for effective environmental management. The objectives of this study were to determine the relationship between the severity of SWR and its persistence and to determine the ...
Chau, Henry +3 more
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Soil-water repellency characteristic curves for soil profiles with organic carbon gradients
Geoderma, 2016 Highlights•Water repellency at different soil organic carbon (SOC) contents was measured.•Repellency was restricted to the top 20 cm of the soil profiles.•The sessile drop method is highly sensitive at high SOC contents.•We proposed six repellency ...
, Per Moldrup, B E Clothier
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SOIL-WATER CONTENT DEPENDENCY OF WATER REPELLENCY IN SOILS
Soil Science, 2007Water repellency (WR) of soils is a global phenomenon. It affects hydrological processes such as infiltration, preferential flow, and surface erosion. Although the soil WR varies nonlinearly with soil-water content (w), WR is often determined at one fixed soil-water content. For a coarse sandy soil, we provide a comparison of the whole WR-w curve under
Lis W. de Jonge +2 more
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2018
Capillary forces in unsaturated soils depend on the surface tension of water, the dimensions of soil pores and on the contact angle of the interfaces of the solid phase of soil (soil matrix) and liquid water. The contact angle (angle of wetting) is assumed to be zero, but in real soils is higher, depending on the properties of the thin surface layer ...
Viliam Novák, Hana Hlaváčiková
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Capillary forces in unsaturated soils depend on the surface tension of water, the dimensions of soil pores and on the contact angle of the interfaces of the solid phase of soil (soil matrix) and liquid water. The contact angle (angle of wetting) is assumed to be zero, but in real soils is higher, depending on the properties of the thin surface layer ...
Viliam Novák, Hana Hlaváčiková
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Modelling soil-water dynamics in the rootzone of structured and water-repellent soils
Computers & Geosciences, 2018Abstract In modelling the hydrology of Earth's critical zone, there are two major challenges. The first is to understand and model the processes of infiltration, runoff, redistribution and root-water uptake in structured soils that exhibit preferential flows through macropore networks.
Hamish E. Brown +7 more
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1992
Water repellent soils exhibit hydrophobic properties when dry, resisting or retarding water infiltration into the soil matrix (Brandt, 1969a). Infiltration rates may be reduced by an order of magnitude, even in soils which visually appear to wet “normally” (Wallis et al., 1991).
M. G. Wallis, D. J. Horne
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Water repellent soils exhibit hydrophobic properties when dry, resisting or retarding water infiltration into the soil matrix (Brandt, 1969a). Infiltration rates may be reduced by an order of magnitude, even in soils which visually appear to wet “normally” (Wallis et al., 1991).
M. G. Wallis, D. J. Horne
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USEFUL SOIL-WATER REPELLENCY INDICES
Soil Science, 2008Water repellency (WR) has been classically characterized at fixed (usually oven-dry) soil water content (θ g ) in terms of the soil water contact angle (CA), a. However, a has been previously reported to depend upon θ g in a nonlinear fashion, such that WR increases from a wettable state close to saturation (θ g-min ) up to a maximum, α max ...
Regalado, C M +5 more
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