1. Thünen Institute of Climate-Smart Agriculture; Bundesallee 50 D-38116 Braunschweig Germany
2. Laboratory of Isotope Geology and Geoecology; Institute of Geological Sciences, University of Wrocław; ul. Cybulskiego 30 50-205 Wrocław Poland
3. Department of Crop Sciences; University of Göttingen; Büsgenweg 5 D-37077 Göttingen Germany