Effects of kaolinite and drying temperature on the persistence of soil water repellency induced by humic acids

Lichner, Ľubomír; Babejova, Natalia; Dekker, L.W.

doi:10.17221/4225-pse

Cited by 15 publications

(14 citation statements)

References 13 publications

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“…It is notable that the water repellency re-appeared during a drying phase at a water content between 10-20% in a previous study (Lichner et al 2002). Water repellency in the same sand ma- The results demonstrate that kaolinite is effective in alleviating the water repellency induced with stearic acid (Figure 2).…”

Section: Resultsmentioning

confidence: 53%

Effect of kaolinite and Ca-montmorillonite on the alleviation of soil water repellency

Dlapa¹,

Doerr²,

Lichner³

et al. 2004

Plant Soil Environ.

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The effects of adding 1-3% (weight) kaolinite or Ca-montmorillonite on the we�ability of silica sand, made highly water repellent with stearic acid, was studied during we�ing and prolonged drying phases at 50°C. The persistence of water repellency was estimated with the water drop penetration time (WDPT) test. A�er we�ing water repellency disappeared in all the samples. During the drying phase, water repellency re-appeared in all samples (untreated and clay-treated) as the water content decreased below 1%. Repellency did, however, not reach pre-we�ing levels. The effect of clay additions on water repellency differed strongly between the two clay types. Kaolinite reduced WDPT, while Ca-montmorillonite caused an increase in WDPT in the already highly repellent sand. Potential mechanisms for the alleviation effectiveness of kaolinite are proposed, with key factors being the high adhesion forces between water and clay mineral surfaces, and the ability kaolinite to disperse. In the case of Ca-montmorillonite, its lower affinity for water may lead to a displacement of water molecules at mineral surfaces by amphiphilic organic compounds, which may result in increased repellency. This phenomenon clearly requires further investigation.

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Section: Resultsmentioning

confidence: 53%

Effect of kaolinite and Ca-montmorillonite on the alleviation of soil water repellency

Dlapa¹,

Doerr²,

Lichner³

et al. 2004

Plant Soil Environ.

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“…On the other hand, lipids may also reduce the soil hydraulic conductivity of the rhizosphere, making the extraction of water by roots more difficult. Additionally, some components of mucilage, when in contact with soil particles or under certain physical or biological conditions, may bind and produce an exposed water‐repellant surface that affects the soil wettability and therefore causes water repellency (Czarnes et al, 2000; Lichner et al, 2002).…”

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confidence: 99%

Is the Rhizosphere Temporarily Water Repellent?

Moradi

Carminati

Lamparter

et al. 2012

Vadose Zone Journal

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The rhizosphere has a controlling role in the flow of water and nutrients from soil to plant roots; however, its hydraulic properties are not well understood. As roots grow, they change the pore size distribution of the surrounding soil. Roots release polymeric substances such as mucilage into their rhizosphere. Microorganisms living in the rhizosphere feed on these organic materials and release other polymeric substances into the rhizosphere. The presence of these organic materials might affect the water retention properties and the hydraulic conductivity of the rhizosphere soil during drying and rewetting. We used neutron radiography to monitor the dynamics of water distribution in the rhizosphere of lupin (Lupinus albus L.) plants during a period of drying and rewetting. The rhizosphere was shown to have a higher water content than the bulk soil during the drying period but a lower one during the subsequent rewetting. We evaluated the wettability of the bulk soil and the rhizosphere soil by measuring the contact angle of water in the soil. We found significantly higher contact angles for the rhizosphere soil than the bulk soil after drying, which indicates slight water repellency in the rhizosphere. This explains the lower soil water content in the rhizosphere than the bulk soil after rewetting. Our results suggest that the water holding capacity of the rhizosphere is dynamic and might shift toward higher or lower values than those of the surrounding bulk soil, not affected by roots, depending on the history of drying and rewetting cycles.

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“…Dekker et al, 1999;Hallett et al, 2004;Lichner et al, 2003Lichner et al, , 2011Orfánus et al, 2014;Ritsema et al, 1997Ritsema et al, , 2005. Soil hydraulic conductivity is the most important hydrodynamic characteristics in most water-related studies in soil and on many physical processes active on its surface.…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of wetting characteristics in grassland sandy soil

Orfánus

Stojkovová

Rajkai

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:In grasslands where organic and inorganic resources are alternating at scales of individual plants, the transient character is given to certain wetting properties of soil, which then become highly variable both in space and in time. The objective of presented study was to study wetting pattern within two soil horizons at 5-cm and 10-cm depths respectively and to examine how the wetting patterns relate to hydraulic conductivity determined by Minidisc infiltrometer at suction -2 cm, K (-2 cm) . This characteristics is implicitly independent on antecedent soil water content (SWC) since it relates to steady infiltration phase but can be influenced by present soil water repellency (SWR). Field measurements were performed on July 27-28, 2010 on the grassland experimental site located near the village Sekule in Southwest Slovakia. The water drop penetration time (WDPT), SWC and tension Minidisc infiltration measurements were carried out on the 0.64 m 2 plot in a regular 8 x 8 grid. The results showed that SWR and SWC influence each other and cause correlation between spatial patterns of studied soil wetting characteristics and between characteristics measured at the two soil depths. Further, it was found out, that calculation of K (-2 cm) according to Zhang may cause apparent correlation of K (-2 cm) with antecedent SWC, which is the artificial effect of sorptivity parameter in the equation on steady stage of infiltration process. This pseudocorrelation has disappeared after adopting of Minasny and McBratney (2000) approaches by calculation of K (-2 cm) .

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Effects of kaolinite and drying temperature on the persistence of soil water repellency induced by humic acids

Cited by 15 publications

References 13 publications

Effect of kaolinite and Ca-montmorillonite on the alleviation of soil water repellency

Effect of kaolinite and Ca-montmorillonite on the alleviation of soil water repellency

Is the Rhizosphere Temporarily Water Repellent?

Spatial patterns of wetting characteristics in grassland sandy soil

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