Mineralisation of distinct biogas digestate qualities directly after application to soil

Barduca, Laura; Wentzel, Stefanie; Schmidt, Reiner; Malagoli, Mario; Joergensen, Rainer Georg

doi:10.1007/s00374-020-01521-5

Cited by 20 publications

(4 citation statements)

References 57 publications

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“…As illustrated by the three highest performing treatments in terms of N min,net (D_PM, U_PS and D_CM), which were characterised by a lower TC:TN range (2.0 to 2.8), while the NH 4 + -N:TN ratio was on the higher end of the spectrum (0.6 to 0.7). This observation was supported by the significantly negative relationships found between, respectively, N rel (r = −0.99, p < 0.01) and N min,net (r = −0.83, p < 0.05) with the initial TC:TN of the products, thus reasserting the importance of the C:N ratio of the input materials to predict N mineralisation outcome in soil, in agreement with other findings [61,62].…”

Section: N Mineralisationsupporting

confidence: 88%

Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Reuland

Sigurnjak

Dekker³

et al. 2022

Agronomy

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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 (Nmin, 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 Nmin, 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.

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Section: N Mineralisationsupporting

confidence: 88%

Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Reuland

Sigurnjak

Dekker³

et al. 2022

Agronomy

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“…The CO 2 -C emission from amended soil indicates the C-mineralisation process and the stability of the amendment. During the first days of the incubation of soil amended with digestate from fruit and vegetable wastes, the CO 2 -C emission was enhanced due to the presence in the digestate of OM easily available to soil microorganisms under aerobic conditions, which activates the soil microbial population (Alburquerque et al 2012b;Barduca et al 2020;Häfner et al 2022); subsequently, the microbial respiration rate declined along the incubation, following a pattern similar to that found for other digestates (de la Fuente et al 2013;Reuland et al 2022). Such behaviour is characteristic of a first-order kinetic process.…”

Section: Discussionsupporting

confidence: 56%

Carbon and Nitrogen Mineralisation in Soils and Nutrient Efficiency of Digestates from Fruit and Vegetable Wastes

Álvarez-Alonso

Clemente

Bernal

2022

J Soil Sci Plant Nutr

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A significant amount of fruit and vegetable wastes is generated annually in markets, supermarkets, restaurants and households. Anaerobic digestion allows their appropriate management and helps to complete the cycle of the circular economy as it converts wastes into resources: biogas, a renewable source of energy, and digestate, rich in nutrients of interest for agriculture. The aim of this study was to define the agronomic value of digestate from fruit and vegetable wastes. Two digestates from fruit and vegetable residues were used in incubation experiments for C and N mineralisation in the soil, and in a pot experiment with crops (cardoon and maize), to calculate their fertiliser potential in comparison with a mineral fertiliser. The digestate quickly mineralised in the soil and nitrification processes led to fast formation of NO3−-N. However, increasing the digestate application rate enhanced N-immobilisation and reduced N-mineralisation in the soil. The addition of digestates to the soil resulted in adequate plant growth and nutrient composition, without any negative effects on the plants or soil. However, special attention should be paid to the salt accumulation in the soil for long-term digestate application. The nutrient recovery efficiency indicated that digestate could replace mineral fertiliser completely in cardoon crops and partially (44.5–82.6%) for maize, with an associated economic benefit. The salinity of the digestates limits their quality and their agricultural use to salt-sensitive crops should be limited.

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“…by 2030 (Kampman et al 2017). Biogas production generates digestate as waste (180 million tons in Europe alone; Corden et al 2019), and the separation of the raw digestate increases the quality of the liquid fraction as a fertiliser (Barduca et al 2021).…”

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confidence: 99%

Organic fertilization induces changes in soil nitrogen mineralization and enzyme activities

Yagüe-Carrasco¹,

Lobo²,

García³

2023

PLANT SOIL ENVIRON

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The EU's Circular Economy Action Plan promotes the use of organic waste as fertiliser, thus allowing the recycling of nutrients in the agricultural system. Also, the Common Agricultural Policy of the EU establishes that 25% of the area will be under organic cultivation by 2030 and that there will be a 20% reduction in mineral fertiliser by this date. In this regard, the use of agricultural organic waste as fertiliser is proposed as a sustainable alternative to mineral fertiliser. In addition, organic residues contribute to the 4 × 1 000 initiative with respect to the increase in soil organic carbon (C) content (Poulton et al. 2017). This endeavour seeks to demonstrate that a small increase in organic C storage (4‰ per year) is crucial to improve soil fertility and yields and will contribute to mitigating climate change.Agricultural production is leading to increasing amounts of organic waste, including new organic residues from agri-food industries and farms (e.g. spent mushroom substrates and digestates). In this regard, mushroom production has risen in the last decade and is forecasted to continue growing. In the context of organic waste, the volume of biogas produced in the 28 EU countries increased from 93

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Mineralisation of distinct biogas digestate qualities directly after application to soil

Cited by 20 publications

References 57 publications

Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Carbon and Nitrogen Mineralisation in Soils and Nutrient Efficiency of Digestates from Fruit and Vegetable Wastes

Organic fertilization induces changes in soil nitrogen mineralization and enzyme activities

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