1. Institute of Plant Nutrition and Soil Science, Kiel University, Hermann‐Rodewald‐Str. 2, 24118 Kiel, Germany
2. College of Resources and Environment Science, Agricultural University of Hebei, China
3. Deutsche Forschungsanstalt für Lebensmittelchemie, Leibniz‐Institut, Lise‐Meitner‐Str. 34, 85354 Freising, Germany
4. Landwirtschaftskammer Schleswig‐Holstein, Am Kamp 15–17, 24768 Rendsburg, Germany