Effect of matric potential and soil-water-hydrogel interactions on biohydrogel-induced soil microstructural stability

Buchmann, Christian; Steinmetz, Zacharias; Brax, Mathilde; Peth, Stephan; Schaumann, Gabriele E.

doi:10.1016/j.geoderma.2019.114142

Cited by 15 publications

(5 citation statements)

References 40 publications

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“…11,14–18 Carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC) and alginate-based biodegradable hydrogels have already established their property of nutrient uptake and delivery, along with excellent water holding capacity, non-toxicity, and renewability. 19–22 However, their versatile applicability is hindered by the low mechanical strength of the materials. The composite formulation of the LDH material with biodegradable hydrogels presents a mutual complementary system, where the LDH material induces mechanical stability in the composite, while the hydrogel polymer provides structural barrier with soil acidity, along with water retention property.…”

Section: Introductionmentioning

confidence: 99%

“…Several works improvising this concept have been reported. 19–22 . [Zn–Al–NO 3 − ]–LDH encapsulated with biodegradable alginate beads for enhanced nitrogen fertilization, 23 composites of norfloxacin-intercalated Mg–Al LDH with carboxymethyl cellulose, cross-linked by citric acid for biomedical applications, 24 carboxymethyl cellulose-based nanocomposite hydrogel beads with Cu–Al LDH for bacterial infection treatment 18 and several other layered nanocomposites are reported to have shown controlled release property.…”

Section: Introductionmentioning

confidence: 99%

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Boosting nitrogen fertilization by a slow releasing nitrate-intercalated biocompatible layered double hydroxide–hydrogel composite loaded withAzospirillum brasilense

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Boosting nitrogen fertilization by a slow releasing nitrate-intercalated biocompatible layered double hydroxide–hydrogel composite loaded withAzospirillum brasilense

et al. 2022

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“…Many factors drive the formation and stability of rhizosphere structure (Denef et al, 2002;Six et al, 2004), among the most important ones are exudates, micro-organisms, and organic matter, which affect inter-particle bonding and flocculation at the microscale (Hallett et al, 2003;Albalasmeh and Ghezzehei 2014;Rashid et al, 2016;Buchmann et al, 2020). Most studies exploring the impact of exudates and associated microbial activities on rhizosphere mechanical properties have typically focused on aggregation and aggregate stability (Ndour et al, 2017;Demenois et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Maize exudates, on the other hand, gelled the soil. More recent research using nuclear magnetic resonance relaxometry has quantified chemical interactions that drive gelling by mucilages in soils (Buchmann et al, 2020). Some of the gelling in soils are driven by improved interparticle bonding (Brax et al, 2020), but mucilages may also have non-Newtonian behaviour affecting rheological response to fast (e.g., rapid aggregate breakdown) or slow (e.g., root growth) mechanical stresses in soil (Haas et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Interacting effects of root exudate compounds and δ13C-barley shoot residue on micro-mechanical behaviour of soil measured by rheometry

Oleghe

Naveed

Baggs

et al. 2022

Preprint

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Laboratory studies have shown that rhizodeposits could lead to either soil structural formation or dispersion depending on plant species, soil conditions, and microbial activity. However, these studies have usually been conducted in dry soils and rarely considered the combined effect of rhizodeposit and organic residues on soil structure. This study hypothesizes that root exudates promote soil dispersion initially, but over time decomposition of root exudates produce binding agents that promote stable soil structure in the rhizosphere. To test this hypothesis, a sandy loam soil sieved to < 500 μm particle size was first amended with root exudate compounds (14.4 mg C g-1), δ13C-barley residue (0.44 mg C g-1 soil), or both. Six replicate samples per treatment were packed in cores to a bulk density of 1.27 g cm-3 and then equilibrated on a tension table at -2 kPa matric potential. Rheological measurements of flow characteristics (dynamic viscosity) and strength (storage modulus, loss modulus, tan δ, and yield stress) of the control and amended soils were obtained immediately after amendment and after twelve days of incubation at 20 oC. Only root exudate compounds initially decreased the capacity of soil to retain water at -2 kPa by 21% and by 49% after incubation. Likewise, the yield stress of root exudate amended soil was significantly (P < 0.05) lower than that of the unamended soil, reflecting dispersion of soil. However, microbial decomposition/activities significantly (P < 0.05) increased yield stress over the corresponding pre-incubation values for these treatments by 200% (root exudate) and 230% (root exudate + δ13C-barley residue). These results confirmed the hypothesized dual effect of root exudates on rhizosphere structure. The initial soil dispersion may facilitate root growth by augmenting soil penetrability and releasing nutrients that were occluded in soil aggregates, whereas stable soil structure is achieved upon decomposition of root exudates.

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“…Although biopolymers are able to reinforce both fine-grained soils and coarse-grained soils, they have shown better strengthening effect in fine-grained soils [12,25,35,36]. For sands, biopolymer hydrogels become rigid fibres after drying and act as bridges to connect sand particles, leading to increased cohesion and improved mechanical strength [9,37].…”

Section: Introductionmentioning

confidence: 99%

The Optimisation Analysis of Sand-Clay Mixtures Stabilised with Xanthan Gum Biopolymers

Hao

Chen

et al. 2021

Sustainability

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Sand–clay mixtures can be encountered in both natural soils (e.g., residual soils, clay deposits and clinosols) and artificial fills. The method of utilising biopolymers in ground improvement for sand–clay mixtures has emerged recently. However, a full understanding of the strengthening effect of biopolymer-treated sand–clay mixtures has not yet been achieved due to a limited number of relevant studies. In this study, xanthan gum (XG), as one of the eco-friendly biopolymers, was used to treat reconstituted sand–clay mixtures that had various compositions in related to clay (or sand) content and clay type (kaolin and bentonite). A series of laboratory unconfined compression strength (UCS) tests were conducted to probe the performances of XG-treated sand–clay mixtures from two aspects, i.e., optimum treatment conditions (e.g., XG content and initial moisture content) to achieve the maximum strengthening effect and strengthening efficiency for the sand–clay mixtures with different compositions. The experimental results indicated that the optimum initial moisture content decreased as the sand content increased. The optimum XG content, which also decreased with the increasing sand content, remained approximately 3.75% for all sand–kaolin mixtures and 5.75% for all sand–bentonite mixtures if calculated based on clay fraction. While untreated sand–kaolin mixtures and sand–bentonite mixtures had comparable UCS values, XG-treated sand–kaolin mixtures seemed to have better improved mechanical strength due to higher ionic (or hydrogen) bonds with XG and low-swelling properties compared with bentonite. The deformation modulus of XG-treated sand–clay mixtures were positively related with UCS. The variation in UCS and stiffness for each treatment condition increased as the sand content was elevated for both sand-kaolin and sand-bentonite mixtures. An increment in the proportion of the heterogeneous composite formed by irregular sand particles conglomerated with the XG–clay matrix in total soil might be responsible for this phenomenon.

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Effect of matric potential and soil-water-hydrogel interactions on biohydrogel-induced soil microstructural stability

Cited by 15 publications

References 40 publications

Boosting nitrogen fertilization by a slow releasing nitrate-intercalated biocompatible layered double hydroxide–hydrogel composite loaded withAzospirillum brasilense

Boosting nitrogen fertilization by a slow releasing nitrate-intercalated biocompatible layered double hydroxide–hydrogel composite loaded withAzospirillum brasilense

Interacting effects of root exudate compounds and δ13C-barley shoot residue on micro-mechanical behaviour of soil measured by rheometry

The Optimisation Analysis of Sand-Clay Mixtures Stabilised with Xanthan Gum Biopolymers

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