Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
Baoji Extension and Service Centre of Agricultural Technology Baoji 721001 P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
College of Natural Resources and Environment Shanxi Agricultural University Taigu 030801 P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
Institute of Soil Fertilizer and Water-saving Agriculture Gansu Academy of Agricultural Sciences Lanzhou 730070 P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and Environment Northwest A&F University Yangling 712100 P.R.China;
chemical fertilizer; organic manure; mineral-associated OC; particulate OC; Light-POC; Heavy-POC;