1. Division of Soil Hydrology, Georg‐August University of Göttingen, Göttingen 37077, Germany
2. Department of Agricultural Engineering, Faculty of Agriculture, University of Khartoum, Khartoum North, 13314, Shambat, Sudan
3. Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany