Ultisols
Ultisols
Ultisols (pronounced: /ʌlˈtɪsɒls/), also known as weathered tropical soils, are a type of soil typically found in humid tropical and subtropical regions. The term "Ultisol" is derived from the Latin word "ultimus", meaning "last", indicating that these soils are the last stage of weathering before becoming Oxisols.
Characteristics
Ultisols are characterized by a subsurface horizon, known as an argillic horizon, which has higher clay content than the surface horizon. They are typically acidic, with a pH less than 6.0, and have a low base saturation. Ultisols are often reddish or yellowish due to the presence of iron oxides.
Distribution
Ultisols are found in various parts of the world, including Southeast Asia, Africa, South America, and the southeastern United States. They cover approximately 8.1% of the global ice-free land area.
Use and Management
Despite their acidity and low fertility, Ultisols can be productive with proper management, such as the addition of lime to raise the pH and the use of fertilizers to add nutrients. They are often used for growing crops such as rice, tea, and rubber.
Related Terms
External links
- Medical encyclopedia article on Ultisols
- Wikipedia's article - Ultisols
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