1. University of Natural Resources and Life Sciences Vienna (BOKU), Division of Agronomy, Department of Crop Sciences, Konrad-Lorenz-Strabe 24, 3430 Tulln, Austria
2. Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Agro-Environmental Chemistry and Plant Nutrition, Kamycka 129, 165 21 Prague 6 - Suchdol, Czech Republic