1. College
of Resources and Environmental Sciences, China Agricultural University, 2 Yuanmingyuan West Road, 23 Haidian District, Beijing 100193, China
2. College
of Agriculture, Guangxi University, 100 East University Road, Nanning 530004, China
3. Stockbridge
School of Agriculture, University of Massachusetts, 161 Holdsworth Way, Amherst, Massachusetts 01003, United States
4. Department
of Analytical Chemistry, Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06504-1106, United States
5. Green
Manure Group, Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture of China/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, No. 12. South Street, Zhongguancun, 26 Haidian District, Beijing 100081, China