1 | Department of Grain and Forage Seed Agronomy, Norwegian Institute of Bioeconomic Research, NIBIO Apelsvoll, Nylinna 226, 2849 Kapp, Norway |
2 | Institute for Plant Nutrition and Soil Sciences, Christian-Albrechts-Universitaet Kiel, Hermann-Rodewald-Straße 2, 24118 Kiel, Germany |