生产性土地面积比重 Proportion of productive land area (X1) | 0.8663*** | 0.8852*** | 0.3180** | 1.2032*** |
人均粮食产量 Per capita grain yield (X2) | 0.4889** | 0.4240** | -0.2182* | 0.2058* |
灌溉水平 Irrigation level (X3) | 0.2631** | 0.2136* | 0.0116 | 0.2252* |
人均GDP情况 Per capita GDP (X4) | 0.3591* | 0.3619** | 0.1007 | 0.4626 |
棉花比较效益 Comparative benefit of cotton (X5) | 1.0390* | 1.0328* | 0.3328*** | 1.3656*** |
机械化水平 Mechanization level (X6) | 0.4320** | 0.4186** | -0.1245* | 0.2911** |
化肥施用量 Consumption of chemical fertilizers (X7) | 0.0772 | 0.0639 | 0.0281 | 0.0920 |
塑料薄膜使用情况 Consumption of plastic film (X8) | 0.1092 | 0.1164 | 0.0334 | 0.1498 |
交通运输网密度 Traffic network density (X9) | -0.1840* | 0.1526 | -0.0214 | 0.1312* |
政策虚拟变量 Policy dummy variable (X10) | 0.4798** | 0.4173*** | 0.1017** | 0.5190*** |