Carbon dioxide equivalent emissions from corn silage fermentation

The European Climate Law recently codified the goal for European climate neutrality by 2050, highlighting the need for sustainable farming practices within a robust and transparent carbon dioxide equivalent (CO(2)e) accounting system. In the present study, a series of equations were proposed for the estimation of CO(2)e emissions from corn silage fermentation. Systematic review of previous meta-analyses of corn silage fermentation identified the mean and standard deviation statistics for key model inputs of acetic acid, ethanol, lactic acid, ammonia, and volatile-corrected dry matter loss. Estimates of CO(2)e emissions were determined for a mock dataset comprising 1,000 iterations of randomly-generated values for each metric in accordance with mean and variance statistics of the source data. Estimates for CO(2)e emissions of corn silage based on meta-analysis review of laboratory experiments were 1.9 +/- 5.6% (GWP(20)) and 0.2 +/- 5.5% (GWP(100)) of silage dry matter. Furthermore, model results demonstrated a precedent for CO2 recycling by silage microorganisms, which was supported by genome annotation of strains belonging to common silage species. Linear model equations for GWP(20) and GWP(100) with inputs and outputs in mg kg(-1) silage dry matter were developed, where inputs are acetic acid (A), ethanol (E), lactic acid (L), and volatile corrected dry matter loss (D-V). Linear equations are (for GWP(20); Eq. 11):GWP(20 )= -3626.1-0.04343A+0.8011E-0.03173L+1.46573D(V)and for GWP(100); Eq. 12:GWP(100) = -8526.10-0.22403A-0.11963E-0.03173L+1.46573D(V).

Automated summary

The European Climate Law establishes the goal of European climate neutrality by 2050 and emphasizes the importance of sustainable farming practices and a transparent CO(2)e accounting system. This study proposes equations to estimate CO(2)e emissions from corn silage fermentation and conducts a systematic review of previous meta-analyses to determine key model inputs. The estimation of CO(2)e emissions for corn silage indicates a range of 1.9 +/- 5.6% (GWP(20)) and 0.2 +/- 5.5% (GWP(100)) of silage dry matter. The study also demonstrates the potential for CO2 recycling by silage microorganisms and develops linear model equations for GWP(20) and GWP(100) based on inputs and outputs in mg kg(-1) silage dry matter.