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Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles

Gregory Reuland (UGent) , Ivona Sigurnjak (UGent) , Harmen Dekker, Steven Sleutel (UGent) and Erik Meers (UGent)
(2022) AGRONOMY-BASEL. 12(2).
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Abstract
The carbon (C) and nitrogen (N) mineralisation rates of five digestates were studied and compared with pig slurry, compost, and a solid fraction of digestate in aerobic incubation experiments. The objective was to identify the most relevant drivers of C and N mineralisation based on the physicochemical properties of the products. Net organic nitrogen mineralisation of digestates (N-min,N-net) was on average 30%, although the range was relatively wide, with digestate from pig manure (39%) reaching double the value of digestate from sewage sludge (21%). The total carbon to total nitrogen (TC:TN) (r = -0.83, p < 0.05) and ammonium nitrogen to total nitrogen (NH4+-N:TN) (r = 0.83, p < 0.05) ratios of the products were strongly correlated with N-min,N-net, adequately mirroring the expected fertilising potential of the products. The digestates had C sequestration values between 50 and 81% of applied total organic carbon (TOC), showcasing their potential to contribute to C build-up in agricultural soils. The carbon use efficiency of the amended soils was negatively correlated with dissolved organic carbon (DOC) (r = -0.75, p < 0.05) suggesting that catabolic activities were promoted proportionately to the DOC present in these products. Ratios of DOC:TOC (r = -0.88, p < 0.01) and TC:TN (r = 0.92, p < 0.01) were reliable predictors of the fraction of C that would remain one year after its incorporation and thus could be used as simple quality parameters to denote the C sequestration potential of digestates prior to their use in the field.
Keywords
Agronomy and Crop Science, digestate, carbon, nitrogen, manure, carbon use efficiency, carbon sequestration, nitrogen mineralisation, nitrification, Nitrates Directive, DISSOLVED ORGANIC-CARBON, ANAEROBIC-DIGESTION, SHORT-TERM, MICROBIAL COMMUNITY, PHYSICAL PROTECTION, N-MINERALIZATION, PIG SLURRY, SOIL C, EMISSIONS, COMPOST

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MLA
Reuland, Gregory, et al. “Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles.” AGRONOMY-BASEL, vol. 12, no. 2, 2022, doi:10.3390/agronomy12020456.
APA
Reuland, G., Sigurnjak, I., Dekker, H., Sleutel, S., & Meers, E. (2022). Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles. AGRONOMY-BASEL, 12(2). https://doi.org/10.3390/agronomy12020456
Chicago author-date
Reuland, Gregory, Ivona Sigurnjak, Harmen Dekker, Steven Sleutel, and Erik Meers. 2022. “Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles.” AGRONOMY-BASEL 12 (2). https://doi.org/10.3390/agronomy12020456.
Chicago author-date (all authors)
Reuland, Gregory, Ivona Sigurnjak, Harmen Dekker, Steven Sleutel, and Erik Meers. 2022. “Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles.” AGRONOMY-BASEL 12 (2). doi:10.3390/agronomy12020456.
Vancouver
1.
Reuland G, Sigurnjak I, Dekker H, Sleutel S, Meers E. Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles. AGRONOMY-BASEL. 2022;12(2).
IEEE
[1]
G. Reuland, I. Sigurnjak, H. Dekker, S. Sleutel, and E. Meers, “Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles,” AGRONOMY-BASEL, vol. 12, no. 2, 2022.
@article{8740487,
  abstract     = {{The carbon (C) and nitrogen (N) mineralisation rates of five digestates were studied and compared with pig slurry, compost, and a solid fraction of digestate in aerobic incubation experiments. The objective was to identify the most relevant drivers of C and N mineralisation based on the physicochemical properties of the products. Net organic nitrogen mineralisation of digestates (N-min,N-net) was on average 30%, although the range was relatively wide, with digestate from pig manure (39%) reaching double the value of digestate from sewage sludge (21%). The total carbon to total nitrogen (TC:TN) (r = -0.83, p < 0.05) and ammonium nitrogen to total nitrogen (NH4+-N:TN) (r = 0.83, p < 0.05) ratios of the products were strongly correlated with N-min,N-net, adequately mirroring the expected fertilising potential of the products. The digestates had C sequestration values between 50 and 81% of applied total organic carbon (TOC), showcasing their potential to contribute to C build-up in agricultural soils. The carbon use efficiency of the amended soils was negatively correlated with dissolved organic carbon (DOC) (r = -0.75, p < 0.05) suggesting that catabolic activities were promoted proportionately to the DOC present in these products. Ratios of DOC:TOC (r = -0.88, p < 0.01) and TC:TN (r = 0.92, p < 0.01) were reliable predictors of the fraction of C that would remain one year after its incorporation and thus could be used as simple quality parameters to denote the C sequestration potential of digestates prior to their use in the field.}},
  articleno    = {{456}},
  author       = {{Reuland, Gregory and Sigurnjak, Ivona and Dekker, Harmen and Sleutel, Steven and Meers, Erik}},
  issn         = {{2073-4395}},
  journal      = {{AGRONOMY-BASEL}},
  keywords     = {{Agronomy and Crop Science,digestate,carbon,nitrogen,manure,carbon use efficiency,carbon sequestration,nitrogen mineralisation,nitrification,Nitrates Directive,DISSOLVED ORGANIC-CARBON,ANAEROBIC-DIGESTION,SHORT-TERM,MICROBIAL COMMUNITY,PHYSICAL PROTECTION,N-MINERALIZATION,PIG SLURRY,SOIL C,EMISSIONS,COMPOST}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{21}},
  title        = {{Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles}},
  url          = {{http://dx.doi.org/10.3390/agronomy12020456}},
  volume       = {{12}},
  year         = {{2022}},
}

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