The Loess Plain is the largest loess plain in the world.
Loess widely exists in dry places,
Loess is actually high-quality soil. It not only has the layered characteristics of humus layer, eluvial layer and sedimentary layer, but also has unique qualities that other soils do not have.
Loess is a very fertile soil layer and is extremely important for agricultural production. This is also the reason why the Loess Plateau is the development of Chinese civilization.
However, the lack of vegetation and soil erosion in the yellow land have caused serious harm to agricultural production and engineering construction, which needs scientific management. In ancient times, the agricultural production environment there was not as bad as it is now.
Red soil develops in tropical and subtropical rainforests, monsoon forest or evergreen broad-leaved forests.
Under the soil. Its main feature is that it is rich in alkali metals and alkaline earth metals.
Iron, alumina, acid red.
The soil here in Fujian is generally red, such as the one on Chashan Mountain.
The soil on the mountain is close to the original soil.
Paddy fields on the plains and mountains are usually black, because
Growing vegetables and rice is made by applying organic fertilizer and mixing fertile soil for many years.
To sum up, loess appears in arid climate, red soil appears in sub-hot, high-temperature and rainy places, and black soil appears in temperate and semi-humid climate areas.
Land is improved and protected by God's face and man's own science.