1. Soil Physics and Land Management Group; Wageningen University; Droevendaalsesteeg 4 6708 PB Wageningen the Netherlands
2. Department of Geoscience and Remote Sensing; Delft University of Technology; Stevinweg 1 2628 CN Delft the Netherlands
3. Soil Physics Department; Helmholtz Centre for Environmental Research; Theodor-Lieser-Straße 4 06120 Halle (Saale) Germany