Centre for Water Science, Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, United Kingdom;Center for Global Environmental Research, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan;Integrated Land Use Systems Group, Macaulay Institute, Aberdeen AB15 8QH, United Kingdom;Fondazione Eni Enrico Mattei (FEEM), Isola di San Giorgio Maggiore, 30124 Venice, Italy;Plant Production Systems group, Wageningen University, P.O. Box 430, 6700 AK Wageningen, The Netherlands