1. Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Research Centre for the Soil-Plant System (CREA-RPS), Rome, Italy
2. Department for Innovation in Biological, Agro-food and Forest systems (DIBAF), University of Tuscia, Viterbo, Italy
3. Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Forestry Research Center (CREA-SEL), Arezzo, Italy