1. Department of Plant Nutrition Key Laboratory of Plant‐Soil Interactions China Agricultural University Ministry of Education Beijing 100193 China
2. Soil Science & Plant Nutrition UWA School of Agriculture and Environment The University of Western Australia Perth WA 6009 Australia
3. Rothamsted Research West Common Harpenden, Hertfordshire AL5 2JQ UK
4. Lancaster Environment Centre University of Lancaster Lancaster LA1 4YQ UK
5. Department of Biological Sciences University of Alberta Edmonton AB T6G 2E9 Canada