which is in the range of commonly used
rates in previous studies (e.g. Bruun et al., 2014; Sun and Lu, 2014;
Lu et al., 2014). Afterwards, the samples were shaken over night to
assure a homogenous mixture of the biochar with the soil. For
slurry and manure, the amounts added were adapted to the
common
field application rate of 150 kg N ha1 corresponding to
0.3 g N per kg dry soil. Due to different C/N ratios, the slurry (C/
N = 10.9) treatments received 3.28 g C kg1 soil and the manure (C/
N = 19.7) treatments 5.91 g C kg1 soil. The dry soil or the soil/
biochar mixture was thoroughly mixed with the slurry or the