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Table 2 Energy consumption [kWh ha −1 ] and greenhouse gases emissions [kg CO 2 eq. ha −1 ] of N fertilizers

From: The use of legumes as a biogas substrate - potentials for saving energy and reducing greenhouse gas emissions through symbiotic nitrogen fixation

Fertilizer type Non-renewable energy input per kg of produced nitrogen [kWh/ kg N] Greenhouse gases emissions during production [t CO 2 eq. ha −1 ] N 2 O emissions after application [kg CO 2 eq. kg −1 of applied fertilizer] N 2 O emissions after application [kg CO 2 eq. kg −1 of inorganic N fertilizer equivalent] Sum of greenhouse gas emissions [kg CO 2 eq. kg −1 of inorganic N fertilizer equivalent]
Digestate, N derived from SNFa - - 2.98b 3.73 3.73
Inorganic nitrogen 16.17 6.032 2.98b 2.98 9.01
  1. aFuel and energy for biogas plant operation belongs to methane production. bAccording to the IPCC scheme [10,12], the N2O emissions after application are similar but due to the lower efficiency, a higher amount is needed. So, the relevant value is the emission per kg of replaced mineral fertilizer (next column).