CO2 production, dissolution and pressure dynamics during silage production: multi-sensor-based insight into parameter interactions. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Li, Menghua; Shan, Guilin; Zhou, Haiyang; Buescher, Wolfgang; Maack, Christian; Jungbluth, Kerstin; Lipski, André; Grantz, David; Fan, Youheng; Ma, Daokun; Wang, Zhongyi; Cheng, Qiang; Sun, Yurui
• Is Part Of: Scientific reports. Volume 7:Issue 1(2017)
• Page Start: 1
• Page End: 9
• Publication Date: 2017-12
• Subjects: Natural history -- Research -- Periodicals; Biology -- Research -- Periodicals; Physical sciences -- Research -- Periodicals; Earth sciences -- Research -- Periodicals; Environmental sciences -- Research -- Periodicals; 502.85
• DOI: 10.1038/s41598-017-14187-1
• Languages: English
• ISSNs: 2045-2322

Abstract

Abstract Silage is a critical global feedstock, but is prone to aerobic deterioration. The dominant mechanism of O2 transport into silage remains unresolved. Here, multiple sensors tracked O2 and CO2, gas pressure (ΔP ) between internal silage and ambient air, pH and silage temperature (Tsi ) during the ensilage of maize and ryegrass. We report the first observation that CO2 produced from microbial respiration was partially dissolved in silage water, with evidence of negative or positiveΔP depending on the changing balance between CO2 production and dissolution. TheΔP < 0 reflected an apparent respiratory quotient (RQ) < 1. Net CO2 production was much greater in anaerobic fermentation stage than in initial aerobic phase or later aerobic feed-out phase. O2 transport into silage is intimately linked to the dynamics of net CO2, ΔP, microbial activity, pH and Tsi . These results suggested that both gas diffusion (based on Fick's law) and advective transfer (Darcy's law) play equally important roles in governing the complex temporal progression of inward and outward gas fluxes to and from the silage interior. Even though low pH suppressed microbial activity and supported aerobic stability, the negativeΔP increased the risk of O2 entry and aerobic deterioration during feed-out phase.