What is Alfisols soil?



Alfisols are moderately leached soils that have relatively high native fertility. These soils have mainly formed under forest and have a subsurface horizon in which clays have accumulated. Alfisols are primarily found in temperate humid and subhumid regions of the world.

What are Alfisols made of?

Alfisols are a soil order in USDA soil taxonomy. Alfisols form in semi-arid to humid areas, typically under a hardwood forest cover. They have a clay-enriched subsoil and relatively high native fertility. “Alf” refers to aluminium (Al) and iron (Fe).

How is Alfisols soil formed?

Alfisols form in loamy parent materials that are not too sandy or too clayey. These soils formed under forest vegetation. They are prominent across the southern lower peninsula and the western UP. Much of Michigan’s most productive ag lands are based on Alfisols.

How do you identify Alfisols?





Alfisols generally show extensive profile development, with distinct argillic (clay) accumulations in the subsoil. Extensive leaching often produces a light-colored E horizon below the topsoil.

What are Alfisols and Vertisols?

Alfisols and Vertisols are the major soil orders in the semi-arid tropics (SAT). Alfisols, the most abundant soils in the semi-arid tropics, cover nearly 33% of the SAT region. They occur extensively in southern Asia, western and central Africa, and many parts of the South America, particularly northeast Brazil.

What is Alfisols good for?

Alfisols are primarily found in temperate humid and subhumid regions of the world. The combination of generally favorable climate and high native fertility allows Alfisols to be very productive soils for both agricultural and silvicultural use.

What crops are grown in Alfisols?

Around the world, alfisols are used intensively for agriculture. In the United States, particularly the Midwest and Great Lakes regions, major crops include grains, corn, and hay [3]. Dairy farming is also common in these areas.

What is the meaning of Ultisols?





Ultisols (from Latin ultimus, “last”) are strongly leached, acid forest soils with relatively low native fertility. They are found primarily in humid temperate and tropical areas of the world, typically on older, stable landscapes.

What is the meaning of Vertisols?

Vertisols (from Latin verto, “turn”) are clay-rich soils that shrink and swell with changes in moisture content. During dry periods, the soil volume shrinks and deep wide cracks form. The soil volume then expands as it wets up.

Are oxisols good for agriculture?

Correct: Yes! Oxisol soils require extensive inputs of lime and fertilizers to be agriculturally productive.

Which soil order is best for agriculture?

Loam soils seem to be the jackpot for all farmers. They include clay, sand, and silt and is the best possible combination of all negative and positive features. It is regarded as the best type of soil and is more gardener-friendly than any others as it does not require any additional investments.

What is the most fertile soil order?

Mollisols



In the United States, they are the most extensive soil order, accounting for about 21.5% of the land area. Mollisols are among some of the most important and productive agricultural soils in the world and are extensively used for this purpose.

What are the 12 types of soil?

This lesson will examine each of these 12 soil orders in turn: Entisols, Inceptisols, Andisols, Mollisols, Alfisols, Spodosols, Ultisols, Oxisols, Gelisols, Histosols, Aridisols, and Vertisols.

Which regions of the United States have Alfisols?

Alfisols Map

  • Dominant Suborders.
  • Aqualfs. Aqualfs, which have warm and aquic conditions, primarily are found in an area bordering the southern part of the Mississippi River, in southern Illinois, and in Indiana and Ohio. …
  • Cryalfs. …
  • Udalfs. …
  • Ustalfs. …
  • Xeralfs.


Why soil is red?

Red soil contains a high percentage of iron content, which is responsible for its color. This soil is deficient in nitrogen, humus, phosphoric acid, magnesium, and lime but fairly rich in potash, with its pH ranging from neutral to acidic.



What type of soil is Aridisols?

Aridisols (from Latin aridus, “dry”) are CaCO3-containing soils of arid regions that exhibit subsurface horizon development. They are characterized by being dry most of the year and limited leaching. Aridisols contain subsurface horizons in which clays, calcium carbonate, silica, salts and/or gypsum have accumulated.

How are Ultisols formed?

Formation: Ultisols form through the processes of clay mineral weathering. Clays, with the possibility of oxides, accumulate in the B subsurface horizon. Ultisols are not as highly weathered as Oxisols. Generally, base-cations, such as calcium, magnesium, nitrate, and potassium have been leached.

What type of soil is Aridisols?

Aridisols (from Latin aridus, “dry”) are CaCO3-containing soils of arid regions that exhibit subsurface horizon development. They are characterized by being dry most of the year and limited leaching. Aridisols contain subsurface horizons in which clays, calcium carbonate, silica, salts and/or gypsum have accumulated.

How do Vertisols form?

Vertisols (from Latin verto, “turn”) are clay-rich soils that shrink and swell with changes in moisture content. During dry periods, the soil volume shrinks and deep wide cracks form. The soil volume then expands as it wets up.

What is the difference between a Mollisol and an Alfisol?

Alfisols are lower in humus content than Mollisols (a similar soil order) and do not have the calcium carbonate accumulation of that soil type. They are less extensively leached of metal ions and develop in cooler climates than the Ultisols, a clay-rich soil order of warmer regions.



Is Mollisol good for agriculture?

Mollisols are among some of the most important and productive agricultural soils in the world and are extensively used for this purpose.

What is Mollisol soil?

The Mollisol order takes its name from the Latin word mollis, meaning soft. These mineral soils have developed on grasslands, a vegetation that has extensive fibrous root systems. The topsoil of Mollisols is characteristically dark and rich with organic matter, giving it a lot of natural fertility.