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Ensiling excessively wilted maize stover with biogas slurry: Effects on storage performance and subsequent biogas potential

Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Sun, Hui;
Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Cui, Xian;
Affiliation
German Biomass Research Center, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Str. 116, Leipzig, Germany
Stinner, Walter;
Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Zhang, Leping;
Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Ju, Xinxin;
Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Guo, Jianbin;
Affiliation
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, China
Dong, Renjie

This study evaluated the ensiling performance of excessively wilted maize stover (EWMS) with biogas slurries and the effect on the subsequent biomethane potential. Chicken and pig manure biogas slurries with or without solid-liquid separation were used to amend the stover humidity before ensiling for 60 d. The hetero-lactic-acid fermentative bacteria Atopostipes and Lactobacillus were enriched by the biogas slurry regardless of the solid-liquid separation. Significant increases in the total organic-acid content were observed in silages with chicken (41%) and pig (15%) manure biogas slurries without solid-liquid separation, which was not the case for treatments with solid–liquid separation. During the ensiling process, more lignocellulose was degraded under the high buffer-capacity provided by the ammonia-nitrogen in the biogas slurry. An increase of 7.1%–9.6% was observed for the specific methane yieldmₑₐsurₑd, which offset a storage loss of 5.0%–7.3%. Ensiling EWMS with biogas slurry therefore provides a viable strategy for biogas production.

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