Two problems about agriculture in monsoon paddy fields

1. water: the agricultural water demand in monsoon paddy field is very large, and the water source should be sufficient. The influence of monsoon paddy field agriculture on water is not clear. Personally, I think it may have changed the distribution of water, that is, artificially changed its natural distribution (paddy field storage on terraced fields).

Soil: The soil should be fertile and suitable for developing monsoon paddy field agriculture. Over-exploitation of agriculture in monsoon paddy fields may lead to soil potential (long-term stagnation of soil, serious hypoxia, more reducing substances, high-priced iron and manganese compounds transformed into low-priced iron and manganese compounds, and soil turned blue-gray or blue-gray). )

Terrain: monsoon paddy field agriculture requires that the terrain is mainly plain, or slightly undulating, but not too big. Monsoon paddy field agriculture will have a certain transformation effect on the terrain, mainly in the terraced landscape in hilly areas.

2. First, the average temperature in the south of China is high, the precipitation is sufficient, and the hydrothermal conditions meet the requirements of rice production.

Second, the southern region is dominated by plains and hills, which are suitable for rice cultivation.

Thirdly, rice planting is a kind of labor-intensive agriculture, and the southern region is densely populated and has sufficient labor.

Fourthly, the history of human exploitation in southern China is relatively long, which has also promoted rice cultivation to some extent.