1. China Agriculture Yearbook;[ECCAY] Editing Committee of China Agriculture Yearbook,2001
2. China Agricultural Machinery Industry Yearbook;[ECCMIY] Editing Committee of China Machinery Industry Yearbook,2001
3. FAOSTAT Online Database;[FAO] Food and Agriculture Organization,2015
4. China Statistical Yearbook;[NBSC] National Bureau of Statistics of China,2001
5. Report on the Comprehensive Utilization and Straw Burning in China;[NDRC] National Development and Reform Commission,2014