[1]Shaanxi Provincial Land Engineering Construction Group Co. Ltd. Xi''''an 710075 China;
[2]Institute of Shaanxi Land Engineering Construction Group Co. Ltd. Xi''''an 710075 China;
[3]Key Laboratory of Degraded and Unused Land Consolidation Engineering Ministry of Land and Resources Xi''''an 710075 China;
[4]Shaanxi Provincial Land Consolidation Engineering Technology Research Center Xi''''an 710075 China;
Tillage methods; Available phosphorus; Available potassium; Dry loess plateau;