2020
DOI: 10.1111/ejss.13007
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Abstract: Plant roots release various organic materials that may modify soil structure and affect heat and mass transfer processes. The objective of this study was to determine the effects of a synthetic root exudate (SRE) on penetrometer resistance (PR), thermal conductivity (λ), hydraulic conductivity (k) and evaporation of water in a sandy soil. Soil samples, mixed with either distilled water or the SRE, were packed into columns at a designated bulk density and water content, and incubated for 7 days at 18°C. Soil PR… Show more

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Cited by 9 publications
(4 citation statements)
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References 58 publications
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“…Higher exudate concentrations resulting in lower PR were reported by Oleghe et al (2017) for a clay loam and-to a smaller extent-for a sandy loam at À50 kPa Ψ m, which is consistent with our findings in loam. In contrast to this, Zhang et al (2020) detected an increase in PR within defined water content groups when adding a synthetic root exudate, specifically at lower water contents in a sand with a similar texture to ours but a higher bulk density of 1.61 g cm À3 . The decisive difference in approach was the incubation of the soil samples at 18 C in Zhang et al (2020) allowing a microbial community to develop, whereas we stored them at 4 C, largely suppressing microbial activity.…”
Section: Penetration Resistance and Energy Required For Penetrationcontrasting
confidence: 89%
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“…Higher exudate concentrations resulting in lower PR were reported by Oleghe et al (2017) for a clay loam and-to a smaller extent-for a sandy loam at À50 kPa Ψ m, which is consistent with our findings in loam. In contrast to this, Zhang et al (2020) detected an increase in PR within defined water content groups when adding a synthetic root exudate, specifically at lower water contents in a sand with a similar texture to ours but a higher bulk density of 1.61 g cm À3 . The decisive difference in approach was the incubation of the soil samples at 18 C in Zhang et al (2020) allowing a microbial community to develop, whereas we stored them at 4 C, largely suppressing microbial activity.…”
Section: Penetration Resistance and Energy Required For Penetrationcontrasting
confidence: 89%
“…In contrast to this, Zhang et al (2020) detected an increase in PR within defined water content groups when adding a synthetic root exudate, specifically at lower water contents in a sand with a similar texture to ours but a higher bulk density of 1.61 g cm À3 . The decisive difference in approach was the incubation of the soil samples at 18 C in Zhang et al (2020) allowing a microbial community to develop, whereas we stored them at 4 C, largely suppressing microbial activity. Gao et al (2017) recognised that PR depends on incubation temperature affecting the microbial community.…”
Section: Penetration Resistance and Energy Required For Penetrationcontrasting
confidence: 89%
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“…Moreover, Zhang et al. (2021) found that microbial activity resulting from root exudates increased the proportion of small pores with diameters <60 μm, which improved soil hydraulic conductivity. Similarly, Feeney et al.…”
Section: The Function Of Plant Rootsmentioning
confidence: 99%