1. College of Land Science and Technology, China Agricultural University , Beijing 100193 , China
2. Institute of Agricultural Equipment, Zhejiang Academy of Agricultural Sciences , Hangzhou 310021 , China
3. Centre for Crop Systems Analysis, Wageningen University, PO Box 430 , Wageningen 6700 AK , The Netherlands
4. Bragato Research Institute, PO Box 845 , Blenheim 7240 , New Zealand
5. The New Zealand Institute for Plant and Food Research Ltd, Marlborough Research Centre, PO Box 845 , Blenheim 7240 , New Zealand
6. Department of Crop Production Ecology, Swedish University of Agricultural Sciences , Ulls väg 16, Uppsala 75651 , Sweden
7. Plant Production Systems, Wageningen University , P.O. Box 430, Wageningen 6700 AK , The Netherlands