1. Department of Earth and Environmental Sciences, University of Pavia, Via S. Epifanio 14, 27100 Pavia, Italy
2. Department of Agricultural and Environmental Sciences—Production, Landscape and Agroenergy, University of Milan, Via Celoria 2, 20133 Milan, Italy
3. Research Centre for Cereal and Industrial Crops, Council for Agricultural Research and Economics (CREA), Via Stezzano, 24, 24126 Bergamo, Italy