1 climate: mainly distributed in tropical, subtropical and temperate monsoon climate zones, with high temperature or high temperature and rain all year round and sufficient heat in summer. Most of them are concentrated in areas with annual precipitation above 800 mm, with abundant precipitation, simultaneous rain and heat, and sufficient water resources.
Topography: mainly concentrated in plains, basins and hilly areas, with flat terrain, deep soil layer, fertile soil and socio-economic reasons.
Labor force: Rice planting and production process is complex and labor intensity is high, while East Asia, Southeast Asia and South Asia are densely populated and rich in labor force.
Cultivated land per capita: Due to the dense population, less cultivated land per capita and high rice yield per unit area, planting rice can alleviate the population's pressure on land and demand for food.
Production habit: Due to the long history and rich traditional experience of planting rice.
6 food preference