Changes in light-textured soil parameters following two successive annual amendments with urban sewage sludge

Zoghlami, Rahma Inès; Hamdi, Hassan; Mokni‐Tlili, Sonia; Khelil, Mohamed Naceur; Aïssa, Nadhira Ben; Jedidi, Naceur

doi:10.1016/j.ecoleng.2016.06.103

Cited by 40 publications

(27 citation statements)

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“…Those for Soil A were 0.69, 0.77, and 1.28% for the same order of treatments. Soil TOC enhancement by sludge addition has been extensively reported in the literature (Hamdi et al., 2019; Obriot et al., 2016; Zoghlami et al., 2016a). At W12, the TOC content in both soils fell drastically compared with W1, showing mineralization rates varying from −46 to −70% for Soil S and from −60 to −90% for Soil A (Table 2).…”

Section: Resultsmentioning

confidence: 97%

“…More precisely, released CO 2 reacts with H 2 O in the soil solution to form carbonic acid (H 2 CO 3 ) and several weak organic acids. This results in a gradual decrease of soil pH (Hamdi et al., 2007a; Stevenson, 1994; Zoghlami et al., 2016a). In comparison to the original pH of the experimental soils (7.24–7.68) and sludge (7.73) (Table 1), there was a significant effect of USS dose on pH decrease at W1 in the following order: control (7.44) > USS‐40 (7.34) > USS‐120 (6.90) for Soil S; control (7.44) > USS‐40 (7.15) > USS‐120 (6.71) for Soil A (Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Urban sewage sludge (USS) reuse in agriculture has made possible the recycling of its organic matter fraction and the partial substitution of mineral fertilizers. In addition to its beneficial effects on soil fertility, nutrient‐rich USS improves soil biological activity and physical properties (Obriot et al., 2016; Zoghlami et al., 2016a). Nevertheless, this complex biowaste contains various contaminants (e.g., pathogens, organic pollutants, and trace elements) that may accumulate in soils and transfer to plants and/or to groundwater (Healy et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The extent of positive or negative impacts on amended soils depends on applied doses, frequency of application, soil type, and climatic conditions (Zoghlami et al., 2016a). For instance, soils having high fine fraction are threatened by contamination and salinization due to greater adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the activity of protease, cellulase, and phosphatase in soil has critical relationships with N, C, and P recycling, respectively (Cenciani, Freitas, Critter, & Airoldi, 2011; Nannipieri, Giagnoni, Landi, & Renella, 2011). Therefore, changes in soil conditions may have significant effects on enzyme activity and nutrient cycling, which rely on microorganisms (Sofi et al., 2016; Zoghlami et al., 2016a). Using two different soil types, the current microcosm study addressed C mineralization and subsequent changes in soil properties after USS application at two rates equivalent to 40 and 120 t ha −1 .…”

Section: Introductionmentioning

confidence: 99%

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Carbon mineralization, biological indicators, and phytotoxicity to assess the impact of urban sewage sludge on two light‐textured soils in a microcosm

et al. 2020

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The agricultural reuse of urban sewage sludge (USS) modifies soil properties depending on sludge quality, management, and pedo‐environmental conditions. The aim of this microcosm study was to assess C mineralization and subsequent changes in soil properties after USS addition to two typical Mediterranean soils: sandy (Soil S) and sandy loam (Soil A) at equivalent field rates of 40 t ha−1 (USS‐40) and 120 t ha−1 (USS‐120). Outcomes proved the biodegradability of USS through immediate CO2 release inside incubation bottles in a dose‐dependent manner. Accordingly, the highest rates of daily C emission were recorded with USS‐120 (3.7 and 3.9 mg kg−1 d−1 for Soils S and A, respectively) after 84 d of incubation at 25 °C. The addition of USS also improved soil fertility by enhancing soil macronutrients, microbial proliferation, and protease activity. Protease showed significant correlation with N, total organic C, and heterotrophic bacteria, reflecting the biostimulation and bioaugmentation effects of sludge. Soil indices like C/N/P stoichiometry and metabolic quotient (qCO2) varied mostly with mineralization rates of C and P in both soils. Despite a significant increase of soil salinity and total heavy metal content (lead, nickel, zinc, and copper) with USS dose, wheat germination was not affected by these changes. Both experimental soils showed intrinsic (Soil A) and incubation‐induced (Soil S) phytotoxicities that were alleviated by USS addition. This was likely due to the enhancement of biodegradation and/or retention of phytotoxicants originating from previous land uses. Urban sewage sludge amendments could have applications in soil remediation by reducing the negative effects of allelopathic and/or anthropogenic phytoinhibitors.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon mineralization, biological indicators, and phytotoxicity to assess the impact of urban sewage sludge on two light‐textured soils in a microcosm

et al. 2020

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Impact of urban sewage sludge on soil physico‐chemical properties and phytotoxicity as influenced by soil texture and reuse conditions

et al. 2020

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Urban sewage sludge (USS) is increasingly applied to agricultural soils, but mixed results have been reported because of variations in reuse conditions. Most field trials have been conducted in cropping systems, which conceal intrinsic soil responses to sludge amendments due to the rhizosphere effect and farming practices. Therefore, the current field study highlights long‐term changes in bare soil properties in strict relationship with soil texture and USS dose. Two agricultural soils (loamy sand [LS] and sandy [S]) were amended annually with increasing sludge rates up to 120 t ha−1 yr−1 for 5 yr under unvegetated conditions. Outcomes showed a USS dose‐dependent variation of all studied parameters in topsoil samples. Soil salinization was the most significant risk related to excessive USS doses. Total dissolved salts (TDS) in saturated paste extracts reached the highest concentrations of 37.2 and 43.1 g L−1 in S soil and LS soil, respectively, treated with 120 t USS ha−1 yr−1. This was also reflected by electrical conductivity of the saturated paste extract (ECe) exceeding 4,000 µS cm−1 in both treatments. As observed for TDS, fertility indicators and bioavailable metals varied with soil texture due to the greater retention capacity of LS soil owing to higher fine fraction content. Soil phytotoxicity was estimated by the seed germination index (GI) calculated for lettuce, alfalfa, oat, and durum wheat. The GI was species dependent, indicating different degrees of sensitivity or tolerance to increasing USS rates. Lettuce germination was significantly affected by changes in soil conditions showing negative correlations with ECe and soluble metals. In contrast, treatment with USS enhanced the GI of wheat, reflecting higher salinity tolerance and a positive effect of sludge on abiotic conditions that control germination in soil. Therefore, the choice of adapted plant species is the key factor for successful cropping trials in sludge‐amended soils.

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Integration of pelleted biosolids with cover crops for improving soil properties

Adeli¹,

Brooks²,

Feng³

et al. 2022

Soil Science Soc of Amer J

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Measuring and assessing soil properties is critical for understanding how changes in agronomic practices affect the capability of soil to support cropping systems. A field study was conducted on a Marietta silt loam soil at the Plant Science Center at Mississippi State University to determine the effects of pelleted biosolids (PBS) relative to poultry litter (PL) and inorganic N fertilizer applied to corn (Zea mays L.) and cotton (Gossypium hirsutum L.) in the presence of winter wheat (Triticum aestivum L.) cover crop (WCC) and winter fallow (WF) on soil properties. Experimental design was a split-plot randomized complete block with three replications. The whole plots were WCC and WF and the subplots were fertilization. Fertilization treatments included PBS and PL at 11.2 Mg ha -1 and 6.7 Mg ha -1 applied to corn and cotton, a one-time single application at 37 Mg PBS ha -1 to corn in 2016, inorganic N fertilizer at the recommended rate, and an unfertilized control. Soil cores were collected after harvest and analyzed for nutrient concentrations, water stable aggregate (WSA), and enzyme activities. The WCC reduced bulk density (ρ b ) and penetration resistance (PR) and increased soil total C (TC), WSA, and infiltration rate, as compared with winter fallow (WF). Relative to inorganic N fertilizer, application of PBS decreased soil ρ b and PR by 3 and 20%, respectively, and increased soil TC, WSA, and infiltration by 19, 23, and 45%, respectively. A combination of PBS and WCC improved soil physical and chemical properties under southeast agroecosystems.

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Changes in light-textured soil parameters following two successive annual amendments with urban sewage sludge

Cited by 40 publications

References 40 publications

Carbon mineralization, biological indicators, and phytotoxicity to assess the impact of urban sewage sludge on two light‐textured soils in a microcosm

Carbon mineralization, biological indicators, and phytotoxicity to assess the impact of urban sewage sludge on two light‐textured soils in a microcosm

Impact of urban sewage sludge on soil physico‐chemical properties and phytotoxicity as influenced by soil texture and reuse conditions

Integration of pelleted biosolids with cover crops for improving soil properties

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