1. Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
2. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
3. Rice Research Institute, Shandong Academy of Agricultural Science, Jinan, China
4. Wheat Research Institute, Weifang Academy of Agricultural Sciences, Weifang, China