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Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration

Caleb Elijah Egene (UGent) , Ivona Sigurnjak (UGent) , Inge C. Regelink, Oscar F. Schoumans, Fabrizio Adani, Evi Michels (UGent) , Steven Sleutel (UGent) , Filip Tack (UGent) and Erik Meers (UGent)
(2021) JOURNAL OF SOILS AND SEDIMENTS. 21(2). p.678-688
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Abstract
Purpose This study investigated the C and N mineralisation potential of solid fractions (SFs) from co-digestated pig manure after P-stripping (P-POOR SF) in comparison with P-rich SFs, as a means to estimate their organic matter stability in soil. Compost (COMP) and biochar (BCHR) (made from P-POOR SF) were also included in the study as reference biosolids. Methods The SFs were incubated in a sandy-loam soil under moist conditions to determine production of CO(2)and mineral N. At specified intervals, CO(2)evolution in the mixtures was measured via the alkali trap method and titration over a period of 81 days, while mineral N was measured using a flow analyser after KCl extraction over a period of 112 days. Results The various SFs showed similar patterns of C mineralisation (15-26% of added total C in 81 days) that were clearly higher than for COMP and BCHR (6% and 7%, respectively). Temporary N immobilisation was observed in biosolids with a high C/N ratio. The effective organic matter (EOM) of the SFs was calculated based on the C mineralisation data and varied between 130 and 369 kg Mg-1. Conclusions The SF with a reduced P content had a high EOM/P ratio which is beneficial in areas where P status of the soil is already high. Moreover, the N mineralisation patterns confirm that a high C/N ratio may also reduce risks for N leaching due to temporary N immobilisation.
Keywords
Earth-Surface Processes, Stratigraphy, Soil organic matter, Solid fraction, Digestate, C, N ratio, Mineralisation, NITROGEN MINERALIZATION, ANAEROBIC-DIGESTION, RESIDUE DECOMPOSITION, ORGANIC AMENDMENTS, N MINERALIZATION, COMPOST, MODEL, BIOCHAR, RELEASE, MATTER

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MLA
Egene, Caleb Elijah, et al. “Solid Fraction of Separated Digestate as Soil Improver : Implications for Soil Fertility and Carbon Sequestration.” JOURNAL OF SOILS AND SEDIMENTS, vol. 21, no. 2, 2021, pp. 678–88, doi:10.1007/s11368-020-02792-z.
APA
Egene, C. E., Sigurnjak, I., Regelink, I. C., Schoumans, O. F., Adani, F., Michels, E., … Meers, E. (2021). Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration. JOURNAL OF SOILS AND SEDIMENTS, 21(2), 678–688. https://doi.org/10.1007/s11368-020-02792-z
Chicago author-date
Egene, Caleb Elijah, Ivona Sigurnjak, Inge C. Regelink, Oscar F. Schoumans, Fabrizio Adani, Evi Michels, Steven Sleutel, Filip Tack, and Erik Meers. 2021. “Solid Fraction of Separated Digestate as Soil Improver : Implications for Soil Fertility and Carbon Sequestration.” JOURNAL OF SOILS AND SEDIMENTS 21 (2): 678–88. https://doi.org/10.1007/s11368-020-02792-z.
Chicago author-date (all authors)
Egene, Caleb Elijah, Ivona Sigurnjak, Inge C. Regelink, Oscar F. Schoumans, Fabrizio Adani, Evi Michels, Steven Sleutel, Filip Tack, and Erik Meers. 2021. “Solid Fraction of Separated Digestate as Soil Improver : Implications for Soil Fertility and Carbon Sequestration.” JOURNAL OF SOILS AND SEDIMENTS 21 (2): 678–688. doi:10.1007/s11368-020-02792-z.
Vancouver
1.
Egene CE, Sigurnjak I, Regelink IC, Schoumans OF, Adani F, Michels E, et al. Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration. JOURNAL OF SOILS AND SEDIMENTS. 2021;21(2):678–88.
IEEE
[1]
C. E. Egene et al., “Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration,” JOURNAL OF SOILS AND SEDIMENTS, vol. 21, no. 2, pp. 678–688, 2021.
@article{8683206,
  abstract     = {{Purpose This study investigated the C and N mineralisation potential of solid fractions (SFs) from co-digestated pig manure after P-stripping (P-POOR SF) in comparison with P-rich SFs, as a means to estimate their organic matter stability in soil. Compost (COMP) and biochar (BCHR) (made from P-POOR SF) were also included in the study as reference biosolids. Methods The SFs were incubated in a sandy-loam soil under moist conditions to determine production of CO(2)and mineral N. At specified intervals, CO(2)evolution in the mixtures was measured via the alkali trap method and titration over a period of 81 days, while mineral N was measured using a flow analyser after KCl extraction over a period of 112 days. Results The various SFs showed similar patterns of C mineralisation (15-26% of added total C in 81 days) that were clearly higher than for COMP and BCHR (6% and 7%, respectively). Temporary N immobilisation was observed in biosolids with a high C/N ratio. The effective organic matter (EOM) of the SFs was calculated based on the C mineralisation data and varied between 130 and 369 kg Mg-1. Conclusions The SF with a reduced P content had a high EOM/P ratio which is beneficial in areas where P status of the soil is already high. Moreover, the N mineralisation patterns confirm that a high C/N ratio may also reduce risks for N leaching due to temporary N immobilisation.}},
  author       = {{Egene, Caleb Elijah and Sigurnjak, Ivona and Regelink, Inge C. and Schoumans, Oscar F. and Adani, Fabrizio and Michels, Evi and Sleutel, Steven and Tack, Filip and Meers, Erik}},
  issn         = {{1439-0108}},
  journal      = {{JOURNAL OF SOILS AND SEDIMENTS}},
  keywords     = {{Earth-Surface Processes,Stratigraphy,Soil organic matter,Solid fraction,Digestate,C,N ratio,Mineralisation,NITROGEN MINERALIZATION,ANAEROBIC-DIGESTION,RESIDUE DECOMPOSITION,ORGANIC AMENDMENTS,N MINERALIZATION,COMPOST,MODEL,BIOCHAR,RELEASE,MATTER}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{678--688}},
  title        = {{Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration}},
  url          = {{http://dx.doi.org/10.1007/s11368-020-02792-z}},
  volume       = {{21}},
  year         = {{2021}},
}
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