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Tropical Red Soils

Tropical Red Soils. Latosols. Zonal Soils of Equatorial Regions. Occur in the continents of South America, Africa and South Asia. They are found near the equator. For example in Brazil. These countries all have an equatorial climate, that is very warm and very wet. Called Latosols.

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Tropical Red Soils

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  1. Tropical Red Soils Latosols

  2. Zonal Soils of Equatorial Regions • Occur in the continents of South America, Africa and South Asia. • They are found near the equator. • For example in Brazil. • These countries all have an equatorial climate, that is very warm and very wet. • Called Latosols.

  3. Low humus Heavy leaching Red colour Sometimes can have a brick like surface. Short nutrient cycle Can support very rich vegetation. Characteristics of Latosols

  4. Low humus content is due to the rapid breakdown of organic material due to the very hot and very wet climate. Leaching is intense, only iron and aluminium compounds remain,this gives soil its red colour. The nutrient cycle is short because there is fast plant growth and rapid decomposition. This means humus is formed and used before leaching occurs. Causes of Characteristics….

  5. Main Process Involved Laterisation

  6. Laterites • Loose topsoil is eroded. • Iron and aluminium layers are exposed. • The high temperatures bake this into a hard brick like surface. • This surface cannot be cultivated. • It is known as a laterite.

  7. Latosol Soil Profile

  8. Latosol Soil Profile • O Horizon; A lot of organic matter, rapid decomposition. • A Horizon; Very thin layer due to short nutrient cycle. • B Horizon; Very deep, intense leaching. • C Horizon; Parent rock.

  9. Uses of Latosol Soils • In many areas with latosol soils there are tropical rainforests. • The soil type can be an obstacle to the development of profitable agriculture. • If forest or vegetation is removed the soil can become infertile within a couple of years.

  10. Exam Questions • Compare and contrast the characteristics of any two soil types which you have studied. (80 marks) • Characteristics; Colour, Texture, Structure, Humus, PH Value, Water content, Fertility. • Also contrast the processes causing these characteristics, climate, locations and uses.

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