Table 4: The slope and F-statistics value of linear regression model of millet yield per unit ().

County (city or banner) Slope F-value Horqin Zuoyi Zhong 0.09 17.1* Kailu 0.19 55.2* Horqin Zuoyi Hou 0.08 25.2* Naiman 0.11 56.1* Hure 0.07 42.5* Aohan 0.07 15.7* Ongniud 0.11 76.8* Ningcheng 0.18 78.5* Harqin 0.06 19.9* Wuyuan 0.05 19.8* Hanggin Hou 0.06 12.3* Dengkou −0.05 6.0* Ejin Horo 0.08 33.5* Liangcheng 0.11 45.1*

*Regression model can reach the significance at the 0.05 level.