| Natural conditions factors |
Proportion of productive land (%) x1
|
Sum of area of cultivated land and grassland/total land area |
| Land production capacity (t/hm2) x2
|
Total grain output/grain sown area |
| Proportion of agriculture suffering disasters (%) x3
|
Agricultural disaster area/cultivated land area |
| Economic and social factors |
Per capita GDP (ten thousand yuan) x4
|
Total regional GDP/total population |
| Urbanization rate (%) x5
|
Urban population/total population |
| Engel coefficient of urban residents (%) x6
|
Per capita food expenditure of urban residents/total per capita consumption expenditure of urban residents |
| Agricultural technological factors |
Agricultural labor productivity (ten thousand yuan / person) x7
|
Total agricultural output value / agricultural labor force |
| Mechanization level (kWh/hm2) x8
|
Total power of agricultural machinery/cultivated land area |
| Effective irrigation rate (%) x9
|
Effective irrigation area/cultivated land area |
| Policy support factors |
Density of transportation network (km/104 km2) x10
|
Total mileage per 100 square kilometers of railways and highways/total land area |
| Policy dummy variable (new policy) x11
|
The policy dummy variable x11 is set according to the relevant provinces in the "Work Program for the Pilot Grass-based Livestock Husbandry Development" released by the Ministry of Agriculture and Rural Affairs in 2015 (the policy support area x11 = 1, non-policy-lacking area x11 = 0) |
| Policy dummy variable (old policy) x12
|
The policy dummy variable x12 is set according to the relevant provinces that support beef cattle, mutton sheep and cows farming in the "Regional Layout Planning of Superior Agricultural Products" released by the Ministry of Agriculture and Rural Affairs in 2003 (the policy support area x12 = 1, non-policy-lacking area x12 = 0) |
