
Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration
- Author
- 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)
- Organization
- 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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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8683206
- 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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