Extent of soil water repellency under long-term no-till soils

Blanco‐Canqui, Humberto; Lal, Rattan

doi:10.1016/j.geoderma.2008.11.036

Cited by 70 publications

(52 citation statements)

References 24 publications

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“…The suitability for storing and transporting water and solutes is strongly influenced by shrinkage and rewetting properties [1,2]. The rewetting properties of most substrates were sufficient, with the exception of HS4, HS12 and HS14 which exceeded the threshold value for the WDPT of 5 s [19]. The shrinkage also showed great variability, ranging between 0.4 and 9.1 vol.…”

Section: Resultsmentioning

confidence: 99%

Hydraulic Performance of Horticultural Substrates—1. Method for Measuring the Hydraulic Quality Indicators

2016

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Besides nutrient composition, the hydraulic performance of horticultural substrates is a main issue for evaluating their quality for horticultural purposes. Their water and air capacity and their suitability for transporting water are important hydraulic quality indicators. Shrinkage and water repellency could have a negative impact on storing and transporting water and solutes. The commonly used methods and devices for quantifying the water retention properties of horticultural substrates (sand box, pressure plate extractor) are outdated. The measurements are time-consuming, the devices are expensive, and the results are affected by uncertainties. Here, the suitability of the extended evaporation method (EEM) and an associated HYPROP (HYdraulic PROPerty analyser, device was successfully tested for very loosely-bedded horticultural substrates. EEM and HYPROP enabled the simultaneous and effective measurement of the water retention curve and the unsaturated hydraulic functions. The measurement time of horticultural substrates ranges between 7 and 10 days. Furthermore, the shrinkage properties and the water rewetting time can be measured with the HYPROP system. Results using 18 horticultural substrates are presented. These results are discussed and compared with natural organic and mineral soils showing the specific hydraulic performance of substrates for horticultural applications.

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Section: Resultsmentioning

confidence: 99%

Hydraulic Performance of Horticultural Substrates—1. Method for Measuring the Hydraulic Quality Indicators

2016

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“…Kořenková et al, 2015). It was shown (e.g., Blanco-Canqui and Lal, 2009;Goebel et al, 2008;Lachacz et al, 2009;Vogelmann et al, 2013) that soil water sorptivity decreased exponentially with increasing SOM content. Czachor et al (2013), Leelamanie and Karube (2007), Vogelmann et al (2013), and Woche et al, (2005) also reported a non-linear increase of the contact angle with SOM content.…”

Section: Introductionmentioning

confidence: 99%

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:The organo-mineral coatings of soil aggregates, cracks, and biopores control sorption and macropore-matrix exchange during preferential flow, in particular in the clay-illuvial Bt-horizon of Luvisols. The soil organic matter (SOM) composition has been hypothesized to explain temporal changes in the hydraulic properties of aggregate surfaces. The objective of this research was to find relations between the temporal change in wettability, in terms of droplet infiltration dynamics, and the SOM composition of coated and uncoated aggregate surfaces. We used 20 to 40 mm sized soil aggregates from the Bt2 horizon of a Haplic Luvisol from loess that were (i) coated, (ii) not coated (both intact), and (iii) aggregates from which coatings were removed (cut). The SOM composition of the aggregate surfaces was characterized by infrared spectroscopy in the diffuse reflection mode (DRIFT). A potential wettability index (PWI) was calculated from the ratio of hydrophobic and hydrophilic functional groups in SOM. The water drop penetration times (WDPT) and contact angles (CA) during droplet infiltration experiments were determined on dry and moist aggregate samples of the three types. The decrease in the CA with time was described using the power function (CA(t) = at -b ). For dry aggregates, the WDPT values were larger for coated as compared to uncoated regions on the aggregate surfaces, and increased with increasing PWI value (R 2 = 0.75). The a parameter was significantly related to the WDPT (R 2 = 0.84) and to the PWI (R 2 = 0.64). The relations between the b parameter and the WDPT (R 2 = 0.61) and the PWI (R 2 = 0.53) were also significant. The WDPT values of wet soil aggregates were higher than those of dry aggregates due to high water contents, which limited the droplet infiltration potential. At the wet aggregate surfaces, the WDPT values increased with the PWI of the SOM (R 2 = 0.64). In contrast to dry samples, no significant relationships were found between parameters a or b of CA(t) and WDPT or PWI for wet aggregate surfaces. The results suggest that the effect of the SOM composition of coatings on surface wettability decreases with increasing soil moisture. In addition to the dominant impact of SOM, the wettability of aggregate surfaces could be affected by different mineralogical compositions of clay in coatings and interiors of aggregates. Particularly, wettability of coatings could be decreased by illite which was the dominant clay type in coatings. However, the influence of different clay mineral fractions on surface wettability was not due to small number of measurements (2 and 1 samples from coatings and interiors, respectively) quantified.

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“…The wetting time was measured using the Water Drop Penetration Time Method (WDPT) (van 't Woudt, 1959, Beardsell et al, 1982, Schmidt, 1995, Blanco-Canqui and Lal, 2009. Starting with the fresh substrate material, one drop of water was added to the substrate and the water penetration time was measured.…”

Section: Hydraulic Measurementsmentioning

confidence: 99%

Hydraulic properties of horticultural substrates

Schindler¹,

Eulenstein²

2017

ODJAR

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Abstract:One main criterion for evaluating the suitability of horticultural substrates for horticultural applications is their capability to store and transport water. The basic substrate hydraulic variables which provide this information are the water retention curve and the unsaturated hydraulic conductivity function. Substrate shrinkage and water repellency are of similar importance. A set of 36 commercial horticultural substrates was selected and the hydraulic properties (water retention curve, unsaturated hydraulic conductivity function, capillary rise and shrinkage) were measured with the Extended Evaporation Method (EEM). Additionally, the water drop penetration time was determined as a measure of wettability. Here the raw data are presented. Data access: http://dx

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Extent of soil water repellency under long-term no-till soils

Cited by 70 publications

References 24 publications

Hydraulic Performance of Horticultural Substrates—1. Method for Measuring the Hydraulic Quality Indicators

Hydraulic Performance of Horticultural Substrates—1. Method for Measuring the Hydraulic Quality Indicators

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Hydraulic properties of horticultural substrates

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