1. Key
Laboratory of Plant-Soil Interactions, Ministry of Education, Center
for Resources, Environment and Food Security, China Agricultural University, Beijing 100193, China
2. Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, United Kingdom
3. School
of Agriculture, Policy and Development, University of Reading, P.O. Box 237, Reading RG6 6AR, United Kingdom
4. State
Key Laboratory of Crop Genetics and Germplasm Enhancement, College
of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China