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Table 4 N2O emissions on an annual base, during the fertilization period, and outside the fertilization period as affected by site, year and nitrification inhibitor (+ NI; –NI). Means not sharing any letter are significantly different within one site, year, and period by Fishers LSD-test at the 5% level of significance (bold marked)

From: Nitrification inhibitors reduce N2O emissions induced by application of biogas digestate to oilseed rape

Study site Year N2O emission
Annual [kg N2O-N ha−1] Fertilization period [kg N2O-N ha−1] Outside fertilization period [kg N2O-N ha−1]
   –NI  + NI –NI  + NI –NI  + NI
Berge 2013 1.08a 0.40a 0.42 0.08a 0.66a 0.33a
2014 0.27a 0.22a 0.07a 0.05a 0.20a 0.16a
2015 0.19a 0.24a 0.01a 0.01a 0.18a 0.23a
  2013–2015 0.51 0.29 0.17 0.05 0.35 0.24
Dedelow 2013 1.13a 0.47a 0.22a 0.09a 0.91a 0.38a
2014 1.20a 0.64b 0.15a 0.03b 1.05a 0.60b
2015 1.10a 0.25b 0.44a 0.01b 0.68a 0.24a
  2013–2015 1.14 0.45 0.27 0.04 0.87 0.41
Ihinger Hof 2013 1.40a 1.72a 0.06a 0.10a 1.34a 1.63a
2014 0.94a 1.15a 0.06a 0.07a 0.88a 1.09a
2015 0.54a 0.35a 0.19a 0.04b 0.35a 0.32a
  2013–2015 0.96 1.08 0.11 0.07 0.86 1.01
Hohenschulen 2013 0.98a 0.96a 0.12a 0.08a 0.86a 0.87a
2014 1.54a 1.21a 0.47a 0.20b 1.07a 1.01a
2015 1.88a 1.28a 0.49a 0.15b 1.39a 1.13a
  2013–2015 1.47 1.15 0.36 0.14 1.10 1.00
Merbitz 2013 3.53a 1.78b 1.82a 0.51b 1.71a 1.27a
2014 2.64a 1.90a 0.05a 0.04a 2.60a 1.87a
2015 2.23a 2.23a 0.17a 0.03a 2.06a 2.20a
  2013–2015 2.80 1.97 0.68 0.19 2.12 1.78
  1. Fertilization period started with the day of the first digestate application and ended 4 weeks after the second digestate application (Table S2)