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Nitrogen and Sulfur Availability in Digestates from Anaerobic Co-digestion of Cover Crops, Straw and Cattle Manure

Fontaine, D; Feng, L; Labouriau, R; Møller, HB; Eriksen, J and Sørensen, P (2020) Nitrogen and Sulfur Availability in Digestates from Anaerobic Co-digestion of Cover Crops, Straw and Cattle Manure. Journal of Soil Science and Plant Nutrition, 20, pp. 621-636.

[thumbnail of Fontaine et al 2019_Nitrogen and sulfur availability in digestates.pdf] PDF - Accepted Version - English
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Document available online at: https://link.springer.com/article/10.1007/s42729-019-00151-7


Anaerobic digestion (AD) has the potential to enhance the availability of nitrogen (N) from green manures; however, part of the sulfur (S) is lost with the biogas. In this study, the N and S availabilities from untreated and digested cover crop (CC) and straw mixtures were measured after application to soil in the laboratory. In addition, a microplot experiment was carried out to assess the N
availability in a spring barley crop. A CC consisting of red clover (Trifolium pratense L.) and chicory (Cichorium intybus L.) was harvested and ensiled with barley straw (Hordeum vulgare L.) at different ratios (1:0, 10:1 and 3:1). The silages were either digested alone or co-digested with cattle manure (CM) in continuously fed anaerobic reactors. Six months after soil application, the net inorganic N release was − 7%, 15% and 25% of total N for untreated CC:straw ratios of 3:1, 10:1 and 1:0, respectively. AD significantly increased the net inorganic N release of these plant materials to 5%, 26% and 38% (mono-digestion) and 40%, 41% and 43% (co-digestion with CM). Results from the laboratory experiment corroborated the field experiment in which AD significantly increased the nitrogen fertiliser replacement value (NFRV) of the CC:straw from 19 to 41% of total N applied. Gaseous loss of S up to 30% was observed during AD while the total N content remained unchanged. Sulfate from untreated CC:straw and digestates was immobilised soon after application to soil, resulting in low availability of inorganic S. Digestion of CC and straw significantly reduced N immobilisation but clearly did not contribute to inorganic S supply.

EPrint Type:Journal paper
Keywords:Digestate, Greenmanure, Nfertiliservalue, Nutrientbalance, Immobilisation
Agrovoc keywords:
Trifolium pratense
spring barley
Subjects: Crop husbandry > Crop combinations and interactions
Soil > Nutrient turnover
Research affiliation: Denmark > Organic RDD 3 > NutHY
Deposited By: Eriksen, Professor Jørgen
ID Code:37575
Deposited On:19 Mar 2020 13:24
Last Modified:10 Mar 2022 14:18
Document Language:English
Refereed:Peer-reviewed and accepted

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