Key Laboratory of Crop Nutrition and Fertilization, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;
College of Resources and Environment, Southwest Agricultural University, Chongqing 400716, P.R.China;
Institute of Plant Protection and Soil Science, Hubei Academy of Agricultural Sciences, Wuhan 430064, P.R.China;
Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, P.R.China;
Key Laboratory of Crop Nutrition and Fertilization, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;