1. Department of Sustainable Agricultural Sciences; Rothamsted Research; Harpenden AL5 2JQ UK
2. Division of Natural Resource Management; ICAR (RC) for NEH Region, Umiam, Ri-Bhoi; Meghalaya 793 103 India
3. Politecnico and University of Torino; Interuniversity Department of Regional and Urban Studies and Planning, Viale Mattioli 39; Torino Italy