High School Geography What is the main plant of purple soil!! Urgent!!!!

Purple soil is a purple or purple-red sandstone and shale formed in the Jurassic and Cretaceous purple sandstone and mudstone eras, and it is said that its purple color can be retained for a long time without fading, and the purple in the soil is mostly rich in calcium (calcium carbonate) and nutrients such as phosphorus and potassium, which is very fertile. Purple soil erosion and weathering are also rapid (mainly due to physical disintegration). The purple soil layer is shallow, usually less than 50 cm, and rarely exceeds 1 meter.

Purple soil generally contains calcium carbonate and has a neutral or slightly alkaline reaction. It is low in organic matter and rich in phosphorus and potassium. Because the purple soil mother rock is loose and easy to disintegrate, rich in mineral nutrients and high fertility, it is one of the important dry farming soils in southern China, except for the top of the hill or the steep slope rock ridge, it has been reclaimed and planted.

Water shortages due to erosion and drought occur from time to time, and it is necessary to build terraces and reservoirs to develop irrigation water sources. Cultivating fertilizer sources to increase soil organic matter and nitrogen content is also an important measure to improve its productivity.

Tea Rice.

Acidic purple soil.

It is distributed in the south of the Yangtze River and the Sichuan Basin.

Vast low hills. The content of soil organic matter and total nitrogen was relatively high, and phosphorus and potassium were slightly low. The soil is acidic, with a lower pH and a low saturation of the salt base.

Sweet potatoes, which are grown as purple sweet potatoes.

Purple soil is divided into three subtypes: acidic purple soil, neutral purple soil and calcareous purple soil.

Acidic purple soil is distributed in the south of the Yangtze River and the vast low mountains and hills of the Sichuan Basin. The content of soil organic matter and total nitrogen was relatively high, and phosphorus and potassium were slightly low. The soil is acidic, with a lower pH and a low saturation of the salt base.

Neutral purple soil is mainly distributed in Sichuan and Yunnan, the soil layer is thinner than acidic purple soil, about 30 to 60cm, the calcium carbonate content is less than 30g kg, the pH value is about, and the fertility level is high, but the organic matter, nitrogen and phosphorus are slightly insufficient.

Calcareous purple soil is mainly distributed in the Sichuan Basin and central Yunnan, with loose soil, calcium carbonate content greater than 6%, soil organic matter about 10g kg, low nitrogen and phosphorus, serious lack of zinc and boron, shallow soil, poor water retention and drought resistance.

I want to be distributed in Jiangxi and Fujian.

Sichuan basin.

Purple soil is mainly composed of purplish-red sandstone and shale. These two rocks are highly susceptible to weathering and developing into purple soil. Purple soil is rich in calcium, phosphorus, potassium and other nutrients, and is the most fertile natural soil in China.

The Sichuan Basin is the place where the purple soil is most concentrated in the country, and it is known as the "purple basin".

Sichuan Basin. There is a geography book on the eighth edition of the Hunan Sect.

Soil developed on fuchsia rock formations. The Sichuan Basin is the most widely distributed, and it is sporadically distributed in the basins of southern provinces. The organic matter content of purple soil is about about, and its development degree is slower than that of red and yellow soil in the same area, and it does not have the characteristics of desiliconization and aluminization, and it is a soil with weak chemical weathering, showing a neutral to slightly alkaline reaction, and the pH value is, the lime content varies with the parent material, and the saturation of the salt base is 80 90%.

Purple soil is rich in mineral nutrients, and is a relatively fertile soil in the hilly areas of the Sichuan Basin, and its agricultural utilization value is very high. In the utilization, it is necessary to prevent soil erosion and pay attention to water storage and irrigation, increase the application of organic fertilizer, and reasonable crop rotation.