1. Department of Grain and forage seed agronomy, Norwegian Institute of Bioeconomy Research (NIBIO), Grimstad, Norway
2. Norwegian Agricultural Extension Service (NLR) Viken, Stokke, Norway
3. Department of Urban Greening and Vegetation Ecology, Norwegian Institute of Bioeconomy Research (NIBIO), Grimstad, Norway
4. Norwegian Agricultural Extension Service (NLR) Øst, Grålum, Norway
5. Department Estates and facilities, Norwegian Institute of Bioeconomy Research (NIBIO), Grimstad, Norway
6. Telemark Seed Grower Association. Gvarv, Norway