Soil water repellency in sandy soil depends on the soil drying method, incubation temperature and specific surface area

Wong, Enoch V.S.; Ward, Phil; Murphy, Daniel V.; Leopold, Matthias; Barton, Louise

doi:10.1016/j.geoderma.2021.115264

Cited by 5 publications

(4 citation statements)

References 46 publications

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“…Secondly, water adsorption on the surface of water‐repellent and wettable sandy soil particles was assessed to find the surface energy (total, dispersive or non‐polar, and specific surface or polar energy) and the surface energy heterogeneity of the soil (Experiment 2). In our previous study, the threshold soil water content at which SWR increased occurred at approximately 75% relative humidity (Wong et al, 2021). Consequently, we hypothesise that the surface energy and surface energy heterogeneity of both wettable and water‐repellent sandy soil will be lower at 90% than at 0% relative humidity.…”

Section: Introductionmentioning

confidence: 81%

“…However, no quantitative data are currently available. In our previous study, investigating how SWR in sandy soil responded to increasing soil water content (Wong et al, 2021), we found that SWR initially remained unchanged with increasing soil water content and only increased (also observed by King, 1981 andRegalado &Ritter, 2005) when the soil water content exceeded a "threshold soil water content" (Wong et al, 2021). The threshold soil water content should not to be confused with "critical soil water content" where water-repellent soil is wettable with further increase in soil water content (Dekker & Ritsema, 1994).…”

Section: Introductionmentioning

confidence: 89%

“…The threshold soil water content should not to be confused with “critical soil water content” where water‐repellent soil is wettable with further increase in soil water content (Dekker & Ritsema, 1994). In Wong et al (2021), the threshold soil water content occurred at a matric potential of approximately −40 MPa to −20 MPa, where more than a monolayer of water molecules is expected to occur (Hatch et al, 2012; Orfanus et al, 2017). In other non‐soil disciplinary studies, a monolayer of water molecules decreased the surface energy of a surface (Israelachvili, 2011; Janczuk & Zdziennicka, 1994) and Goebel et al (2004) found that SWR is inversely proportional to surface energy.…”

Section: Introductionmentioning

confidence: 99%

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Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Wong

Ward

Leopold

et al. 2022

European J Soil Science

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Predicting soil water availability to crops in water‐repellent sandy soil is complicated as soil water repellency (SWR) responds non‐linearly to soil water content. Others have hypothesised that the development of a monolayer of water molecules results in SWR increasing before SWR declines with a further increase in soil water content. In a previous study, we found that SWR increases when above 0.28–0.86% threshold soil water content. Thus, our objective was to determine the underlying mechanisms responsible for why SWR increases when above a certain threshold soil water content in a sandy soil. A water adsorption isotherm was constructed by exposing a water‐repellent sandy soil to increasing relative humidity (dynamic vapour sorption technique) to evaluate if the development of a monolayer of water molecules was responsible for the increased SWR response. The increased SWR when above 0.66% threshold soil water content was found to coincide with the capillary condensation of water in the soil. The inverse gas chromatography technique was used for the first time in soil particles' surface energy analysis to investigate why SWR increases when above the threshold soil water content by determining the total, dispersive (non‐polar), and specific surface (polar) energy of the soil at two relative humidities (0% and 90%). Wettable sandy soil (98% soil organic carbon removed) was included as a control to further assess if soil organic carbon in the water‐repellent soil influences the surface energy of the soil. The mean of total, dispersive, and specific surface energy decreased for both wettable and water‐repellent sandy soils when exposed to 90% relative humidity, suggesting that there was limited effect of soil carbon on the increased SWR when above the threshold soil water content since most organic carbon was removed from the wettable soil. We also investigated if there is any difference in the surface energy heterogeneity when exposed to 90% relative humidity to gain insight into surface chemistry heterogeneity of the soil particles' surfaces. Exposing soils to 90% relative humidity decreased the heterogeneity of the total and dispersive surface energy of both wettable and water‐repellent sandy soil indicating a more uniform surface chemistry than when exposed to 0% relative humidity. Highlights Examined why soil water repellency (SWR) in a sandy soil increases at low soil water content. Explored underlying mechanisms via water adsorption isotherm and surface energy of a sandy soil. Increased SWR coincided with capillary water condensation and is likely due to counterion effects. Quantitative data presented new mechanisms on why SWR increases with increasing soil water content.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Wong

Ward

Leopold

et al. 2022

European J Soil Science

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“…Previous studies on soil water repellency (SWR) have predominantly focused on a specific condition, such as post forest fire (Caltabellotta et al 2022;DeBano 1991;Lucas-Borja et al 2022;Stoof et al 2011), sandy soils (Doerr et al 2005;Siteur et al 2016;Wong et al 2022;Wong et al 2021), under certain tree species known to contain hydrophobic compounds like pine and eucalyptus (Leighton-Boyce et al 2005;Lozano et al 2013;Mataix-Solera et al 2007;Neris et al 2013) or volcanic ash-derived soils (Jordán et al 2011;Jordán et al 2009;Kawamoto et al 2007;). However, SWR under a cacao-based system, with the non-specific conditions mentioned before, has not been well characterized until recently reported by Farrick and Gittens (2022) in Trinidad and Tobago.…”

Section: Organic Matter Water Repellency and Soil Hydrological Functionsmentioning

confidence: 99%

Soil recovery in cacao and coffee agroforestry systems : Litter, roots, carbon, and water

Saputra

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Soil degradation, driven by natural and anthropogenic factors, threatens our ability to support the growing global population and their well-being. Land use systems (LUS) that serve as an interface between 'actors' and 'land cover' can be characterized by GxExM interplay, representing the Genotype (G) by Environment (E) interactions, subject to Management (M). GxExM is a major cause of soil degradation. However, GxExM interactions can also serve as the basis for soil restoration, such as through agroforestry practices that involve retaining, planting, and wellmanaging (M) the right trees (G) in the right places on farms (E). This thesis investigates the capacity of cacao and coffee-based agroforestry systems in Indonesia to support soil recovery from various disturbances while maintaining their multifunctionality and economic performance. To address this question, a comprehensive approach involving spatial patterns, dynamic processes, and modeling techniques was applied. The thesis started with a focus on the soil recovery of different LUS following deforestation in Southeast Sulawesi, Indonesia. The study compared various LUS, including remnant forest, cacao-based agroforestry systems (simple and complex), cacao monoculture, and annual food crops. The findings revealed that complex agroforestry systems with diverse tree species exhibited higher root density in the upper soil layer, which was positively correlated with soil organic carbon (SOC). The increases in root density and SOC were associated with improved macroporosity, although the impact on aggregate stability and soil infiltration was modest. Furthermore, the thesis explores the multifunctionality and economic performance of cacao-based agroforestry systems using the process-based WaNuLCAS model. Different agroforestry systems involving the companion trees and crops were evaluated against various scenarios, including cacao root densities, soil textures, and climate regimes. The simulation results indicated that cacao agroforestry systems outperformed monoculture in terms of carbon stocks but had limited effects on water-related functions. Additionally, high root density cacao systems demonstrated better resilience to water scarcity, emphasizing the importance of root structure. Integration of cacao with annual crops or fruit trees showed the highest economic performance, with fruit tree combinations being more labor-efficient. However, intercropping cacao with fastgrowing trees in water-limited regions was detrimental to multifunctionality and economic performance. The next part of the thesis investigates the impact of volcanic ash deposition on topsoil properties and their recovery in different LUS around Mt. Kelud in East Java, Indonesia. The study compared soil properties before and after the volcanic eruption in remnant forest, coffee-based agroforestry (simple and complex), and annual food crops. Within three years, volcanic ash homogenized soil properties, affecting litter thickness, aggregate stability, and soil infiltration. Although these prope...

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Bermudagrass fairway responses to various combinations of a soil surfactant and nitrogen

Sierra Augustinus,

Arevalo Alvarenga,

Schiavon

2024

Agronomy Journal

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Surfactants are commonly employed in sand‐based turfgrass systems to address soil water repellency, which often results in the formation of preferential flow channels leading to non‐uniform wetting patterns. While the influence of soil moisture on nutrient dynamics is well documented, the potential of surfactants to improve N uptake remains poorly understood. A 2‐year study was conducted on ‘Celebration’ bermudagrass [Cynodon dactylon (L.)] fairway to better understand the interaction between fertility programs (296 or 586 kg N ha−1 year−1 from ammonium sulfate and 564 kg N ha−1 year−1 primarily from a controlled‐release N fertilizer) and surfactant rate and frequency (3.2 L ha−1 every 14 or 28 days, or at 6.4 L ha−1 every 28 days) on turfgrass performance, leaf N content, and soil moisture. Overall, no significant interaction was observed between surfactant treatment and fertility program. During the dry season (November to May), fertility programs influenced turfgrass performance parameters with higher N rates consistently leading to improvements in visual quality, normalized difference vegetation index, percent green cover, and dark green color index; however, no differences were observed during the rainy season (June to October). Surfactants showed no effect on turfgrass performance but led to minimal increase in leaf N content from 3.72% to 3.85%. All surfactant treatments reduced water drop penetration time at 0 cm. Moreover, surfactant treatments applied every 28 days regardless of the rate exhibited a higher volumetric water content compared to those applied every 14 days. Surfactant applications might not be an economically feasible strategy to improve leaf N content in South Florida well‐watered bermudagrass fairways.

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Soil water repellency in sandy soil depends on the soil drying method, incubation temperature and specific surface area

Cited by 5 publications

References 46 publications

Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Soil recovery in cacao and coffee agroforestry systems : Litter, roots, carbon, and water

Bermudagrass fairway responses to various combinations of a soil surfactant and nitrogen

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