Institute of Agricultural Resources and Regional Planning/Key Laboratory of Plant Nutrition and Fertilizer of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;
College of Forestry Hebei Agricultural University Baoding 071000 P.R.China;
Institute of Agricultural Resources and Regional Planning/Key Laboratory of Plant Nutrition and Fertilizer of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;
Tianjin Institute of Agricultural Resources and Environment Tianjin 300192 P.R.China;
Institute of Agricultural Resources and Regional Planning/Key Laboratory of Plant Nutrition and Fertilizer of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;
Institute of Agricultural Resources and Environment Hebei Academy of Agriculture and Forestry Sciences Shijiazhuang 050051 P.R.China;
Institute of Agricultural Resources and Regional Planning/Key Laboratory of Plant Nutrition and Fertilizer of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;
Institute of Agricultural Resources and Regional Planning/Key Laboratory of Plant Nutrition and Fertilizer of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;