What are the nine major commercial grain bases in China?

Taihu Lake Plain, Poyang Lake Plain, Dongting Lake Plain, Jianghan Plain, Jianghuai Area, Chengdu Plain, Songnen Plain, Three River Plain, Pearl River Delta.

Commercial grain bases have the conditions

①Grain production conditions are better, with a larger proportion of high-yield and stable-yield farmland and more surplus grain.

② per capita possession of more food, high commodity rates, high potential for increased production, and less investment and quick results in the region.

3 food production is concentrated, natural conditions and production conditions are basically similar, to facilitate unified planning, construction and layout of production.

④ Food production as the center, food production land and cash crops and other crops production land contradiction is not big, convenient transportation.

Classification

The first category is the original high-yield commercial grain bases in the south, including the Yangtze River Delta, the Jianghan Plain, the Poyang Lake Plain, the Dongting Lake Plain, the Pearl River Delta and other five pieces, which are overcrowded with fewer fields, located in the subtropics, with favorable natural conditions, and with a long growing season for crops that can be matured for more than one year.

The second category, the new development of the Huaihe Plain commercial grain base, including northern Jiangsu and northern Anhui two pieces, they are in the south of the Huanghuaihai Plain, the terrain is flat, the soil layer is deep, the groundwater conditions are better, but also in the warm temperate zone to the north of the subtropical transition zone, precipitation, heat and frost-free period is lower than the south of the Yangtze River and higher than the Yellow River north of the country's important drought and flooding crop grain production area potential.

The third category, the level is still low, the development potential of the largest commercial grain base in Northeast China, including the Three Rivers Plain and Songnen Plain, Jilin Central Plain and Liaoning Central Plain three pieces, the Northeast region is less land, higher latitude, heat conditions are not as good as the South, can only be cooked once a year, the production conditions and the original basis is not as good as the first two types of areas, agricultural operations are crude, the level of grain yields is still low.

The fourth category, is the Northwest Arid Zone commodity grain base, including the Hexi Corridor, Inner Mongolia and Ningxia Hetao area three pieces, here deep inland, annual precipitation is less than 250 millimeters, the climate is arid, the crop growing season is also short, only one year can be a mature.