1. Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 China
2. College of Resources and Environment Southwest University Chongqing 400716 China
3. Institute of Plant Nutrition, Environment and Resources Henan Academy of Agricultural Sciences Zhenzhou 450002 Henan China
4. Hengyang Red Soil Experimental Station Chinese Academy of Agricultural Sciences Hengyang 421001 Hunan China
5. Center of Agricultural Environment and Resources Jilin Academy of Agricultural Sciences Gongzhuling 136100 Jilin China
6. College of Resources and Environmental Sciences Northwest University of Agricultural and Forest Sciences Yangling 712100 Shaanxi China
7. Institute of Soils and Fertilizers Xinjiang Academy of Agricultural Sciences Urumqi 830091 Xinjiang China
8. Institute of Environment, Resources, Soils and Fertilizers Zhejiang Academy of Agricultural Sciences Hangzhou 310021 Zhejiang China
9. Rothamsted Research Harpenden Herts AL5 2JQ United Kingdom