Field scale measurement of greenhouse gas emissions from land applied swine manure
2017
Maurer, DevinL. | Koziel, JacekA. | Bruning, Kelsey
Greenhouse gas emissions (GHGs) from swine production systems are relatively well researched with the exception of emissions from land application of manure. GHGs inventories are needed for process-based modeling and science-based regulations. Thus, the objective of this observational study was to measure GHG fluxes from land application of swine manure on a typical corn field. Assessment of GHG emissions from deep injected land-applied swine manure, fall and reapplication in the spring, on a typical US Midwestern corn-on-corn farm was completed. Static chambers were used for flux measurement along with gas analysis on a GC-FID-ECD. Measured gas concentrations were used to estimate GHGs flux using four different models: linear regression, nonlinear regression, first order linear regression and the revised Hutchinson and Mosier (HMR) model, respectively for comparisons. Cumulative flux estimates after manure application of 5.85 × 10⁵ g•ha–¹ (1 ha = 0.01 km²) of CO₂, 6.60 × 10¹ g•ha–¹ of CH₄, and 3.48 × 10³ g•ha–¹ N₂O for the fall trial and 3.11 × 10⁶ g•ha–¹ of CO₂, 2.95 × 10³ g•ha–¹ of CH₄, and 1.47 × 10⁴ g•ha–¹ N₂O after the spring reapplication trial were observed. The N₂O net cumulative flux represents 0.595% of nitrogen applied in swine manure for the fall trial.
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