Changing soil hydraulic properties and water repellency in a pomegranate orchard irrigated with saline water by applying polyacrylamide

Tadayonnejad, M.; Mosaddeghi, Mohammad Reza; Ghorbani-Dashtaki, Shoja

doi:10.1016/j.agwat.2017.03.026

Cited by 29 publications

(30 citation statements)

References 45 publications

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“…Similar results were reported by Behrends et al (2019). In addition, a slight change in β can have a considerable effect on soil hydraulic properties (Leelamanie & Karube, 2013; Tadayonnejad et al, 2017). Therefore, it is important to determine the impact of conservation tillage on SWR, even if the water contact angle is less than 90°.…”

Section: Discussionmentioning

confidence: 99%

“…Water sorptivity is affected by soil pore structure and water repellency, whereas ethanol sorptivity is only affected by pore structure because ethanol is a nonpolar liquid (Tadayonnejad et al, 2017; Tillman et al, 1989). The water repellency index (RI) was calculated using the following equation (Tillman et al, 1989):

RI = 1.95 \frac{S_{e}}{S_{w}}

Where : S e is the sorptivity of ethanol (mm s –1/2 ) and S w is the sorptivity of water (mm s –1/2 ).…”

Section: Methodsmentioning

confidence: 99%

“…The water repellency index (RI) was calculated using the following equation (Tillman et al, 1989):

RI = 1.95 \frac{S_{e}}{S_{w}}

Where : S e is the sorptivity of ethanol (mm s –1/2 ) and S w is the sorptivity of water (mm s –1/2 ). Detailed information about how to calculate the coefficient can be found in Tadayonnejad et al (2017). Tillman et al (1989) defined soil with RI > 1.95 as subcritical water repellency.…”

Section: Methodsmentioning

confidence: 99%

“…In our study, the h values for water and ethanol were 2 and 2.5 cm, respectively. Water sorptivity is affected by soil pore structure and water repellency, whereas ethanol sorptivity is only affected by pore structure because ethanol is a nonpolar liquid (Tadayonnejad et al, 2017;Tillman et al, 1989). The water repellency index (RI) was calculated using the following equation (Tillman et al, 1989):…”

Section: Swr Characteristicsmentioning

confidence: 99%

“…However, because the degree of SWR in farmland tillage soil is smaller than the forest and fire‐affected soils (Lucas‐Borja et al, 2019; Stavi, Barkai, Knoll, & Zaady, 2016), there is a lack of research on the SWR in farmland, especially for the study on how conservation agriculture affect SWR. The small degree of SWR, known as subcritical water repellency (Hallett, Baumgartl, & Young, 2001), can also have a considerable effect on soil structure and hydraulic properties (Hunter, Chau, & Si, 2011; Tadayonnejad, Mosaddeghi, & Ghorbani, 2017). Therefore, understanding the factors that affect SWR is critically important in improving soil quality.…”

Section: Introductionmentioning

confidence: 99%

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Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Liang

et al. 2020

Land Degrad Dev

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Soil water repellency (SWR) has significant effects on soil degradation by changing some soil processes (e.g., carbon sequestration and soil erosion). Understanding the influence factors of SWR under conservation agriculture are playing a vital role in the sustainable development for improving soil quality. However, how soil pore structure influence on SWR remains unclear. We aim to assess the impact of hydrophobic substances and pore structure on SWR. Here we conducted two long‐term experimental fields with three treatments: conventional tillage (CT), reduced tillage (RT), and no‐tillage (NT). X‐ray tomography and the sorptivity method were used to measure soil pore structure and SWR, respectively. We found that soil organic carbon (SOC) and microbial biomass carbon (MBC) were higher in RT and NT treatments than in CT. MBC had significant influences on soil water sorptivity (Sw) and water repellency index (RI; p < 0.001), whereas SOC had no influence on Sw (p > 0.05). MBC also showed a closer relationship with SWR than SOC in redundancy analysis. The RT and NT increased the porosity of 55–165 μm that had a positive relationship with ethanol sorptivity and RI (p < 0.05). Ethanol sorptivity increased with an increase in soil pore porosity and connectivity under RT and NT treatments. However, increasing the pore surface area could decrease Sw due to enhance contact area between hydrophobic substances and soil water. Overall, the RT and NT treatments increased the water repellency index, which was a result of the interactions between pore structure and hydrophobic substances.

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Section: Discussionmentioning

confidence: 99%

RI = 1.95 \frac{S_{e}}{S_{w}}

Where : S e is the sorptivity of ethanol (mm s –1/2 ) and S w is the sorptivity of water (mm s –1/2 ).…”

Section: Methodsmentioning

confidence: 99%

“…The water repellency index (RI) was calculated using the following equation (Tillman et al, 1989):

RI = 1.95 \frac{S_{e}}{S_{w}}

Section: Methodsmentioning

confidence: 99%

Section: Swr Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Liang

et al. 2020

Land Degrad Dev

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Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Liu

et al. 2023

Soil Science Soc of Amer J

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Drought is increasingly common due to frequent occurrences of extreme weather events, which further increases soil water repellency (SWR). It could reinforce the effect of SWR on soil functions under conservation tillage systems. However, the relationship between SWR and soil hydrological function is still unclear. We studied the impacts of SWR and soil structure on soil hydrological function. Three treatments were conducted in a long-term tillage experiment: conventional tillage (CT), reduced tillage (RT), and no-tillage (NT). Tillage, soil depth, and growth period had significant influences on SWR, soil structure (i.e., penetration resistance [PR], total porosity [TP], and mean weight diameter [MWD]), and soil hydrological functions (i.e., water storage, least limiting water range [LLWR], and plant available water). Compared to CT, NT and RT increased the water repellency index (RI) in 0-20 cm by 13.8%-40.1% and 6.5%-18.2% during the growth period. RI played a prominent role in increasing soil water storage compared to soil TP, PR, MWD, and SOC. PR was the most critical influence on LLWR compared to other variables. A structural equation model revealed that SWR directly affected soil hydrological function, whereas the effect of SWR (0.24) was smaller than that of soil structure (0.67). In addition, soil structure had a direct influence on SWR, indicating that the effect of SWR could be regulated by soil structure. Overall, this study showed a link between SWR and soil hydrological function and provides deeper fundamental insights into the role of SWR on the sustainability of conservation tillage.

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Reviving the Productivity of Salt-affected Lands: Technological Options, Constraints and Research Needs

Sharma

Singh

2019

Research Developments in Saline Agriculture

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Changing soil hydraulic properties and water repellency in a pomegranate orchard irrigated with saline water by applying polyacrylamide

Cited by 29 publications

References 45 publications

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Reviving the Productivity of Salt-affected Lands: Technological Options, Constraints and Research Needs

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