Vertisol

Thursday, 20 December 2012

The Vertisolic Order - Canadian Soil Classification Series

Gambiarra no ar condicionado portatil Midea!

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Alabama
Alabama (ⁱ/ˌæləˈbæmə/) is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama is the 30th-most extensive and the 23rd-most populous of the 50 United States. Alabama ranks second in the area of its inland waterways.
From the American Civil War until World War II, Alabama, like many Southern states, suffered economic hardship, in part because of continued dependence on agriculture. Despite the growth of major industries and urban centers, white rural interests dominated the state legislature until the 1960s, while urban interests and African Americans were under-represented. Following World War II, Alabama experienced growth as the economy of the state transitioned from agriculture to diversified interests in heavy manufacturing, mineral extraction, education, and technology. In addition, the establishment or expansion of multiple military installations, primarily those of the U.S. Army and U.S. Air Force, added to state jobs.

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Argentina
Argentina ⁱ/ˌɑrdʒənˈtiːnə/, officially the Argentine Republic (Spanish: República Argentina [reˈpuβlika aɾxenˈtina]), is a country in South America, the continent's second largest by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires. It is the eighth-largest country in the world by land area and the largest among Spanish-speaking nations.
Argentina's continental area is between the Andes mountain range in the west and the Atlantic Ocean in the east. It borders Paraguay and Bolivia to the north, Brazil and Uruguay to the northeast, and Chile to the west and south. Argentine claims over Antarctica, as well as overlapping claims made by Chile and the United Kingdom, are suspended by the Antarctic Treaty of 1961. Argentina also claims the Falkland Islands (Spanish: Islas Malvinas) and South Georgia and the South Sandwich Islands, which are administered by the United Kingdom as British Overseas Territories.
A recognised middle power, Argentina is Latin America's third-largest economy, with a "very high" rating on the Human development index. Within Latin America, Argentina has the fifth highest nominal GDP per capita and the highest in purchasing power terms. Analysts have argued that the country has a "foundation for future growth due to its market size, levels of foreign direct investment, and percentage of high-tech exports as share of total manufactured goods", and it is classed by investors as middle emerging economy. Argentina is a founding member of the United Nations, Mercosur, the Union of South American Nations, the Organization of Ibero-American States, the World Bank Group and the World Trade Organization, and is one of the G-15 and G-20 major economies.

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Chad
Chad ⁱ/ˈtʃæd/ (French: Tchad, Arabic: تشاد‎ Tšād), officially known as the Republic of Chad, is a landlocked country in Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest, and Niger to the west. Due to its distance from the sea and its largely desert climate, the country is sometimes referred to as the "Dead Heart of Africa".
Chad is divided into multiple regions: a desert zone in the north, an arid Sahelian belt in the centre and a more fertile Sudanese savanna zone in the south. Lake Chad, after which the country is named, is the largest wetland in Chad and the second largest in Africa. Chad's highest peak is the Emi Koussi in the Sahara, and N'Djamena, (formerly Fort-Lamy), the capital, is the largest city. Chad is home to over 200 different ethnic and linguistic groups. Arabic and French are the official languages. Islam and Christianity are the most widely practiced religions.
Beginning in the 7th millennium BC, human populations moved into the Chadian basin in great numbers. By the end of the 1st millennium BC, a series of states and empires rose and fell in Chad's Sahelian strip, each focused on controlling the trans-Saharan trade routes that passed through the region. France conquered the territory by 1920 and incorporated it as part of French Equatorial Africa.

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Deccan Plateau
The Deccan Plateau is a large plateau in India, making up most of the southern part of the country. It rises a hundred meters high in the north, and more than a kilometer high in the south, forming a raised triangle within the familiar downward-pointing triangle of the Indian subcontinent's coastline.
It extends over eight Indian states and encompasses a wide range of habitats, covering most of central and southern India.
It is located between two mountain ranges: the Western Ghats form its western boundary, and the Eastern Ghats its eastern boundary. Each rises from their respective nearby coastal plains and nearly meet at the southern tip of India. It is separated from the Gangetic plain to the north by the Satpura and Vindhya Ranges, which form its northern boundary.
The name Deccan is an anglicised form of the Prakrit word dakkhin, itself derived from the Sanskrit word dákṣiṇa, meaning "south".
The Deccan Plateau lies south of the Indo-Gangetic plain. The Western Ghats Mountain Range is tall and blocks the moisture from the southwest monsoon from reaching the Deccan Plateau, so the region receives very little rainfall. The eastern Deccan Plateau is at a lower elevation spanning the southeastern coast of India. Its forests are also relatively dry but serve to retain the rain to form streams that feed into rivers that flow into basins and then into the Bay of Bengal.

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Ethiopia
Ethiopia ( /ˌiːθiˈoʊpiə/) (Ge'ez: ኢትዮጵያ ʾĪtyōṗṗyā), officially known as the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa. It is the second-most populous nation in Africa, with over 82 million inhabitants, and the tenth largest by area, occupying 1,100,000 km². Ethiopia is bordered by Eritrea to the north, Djibouti and Somalia to the east, Sudan and South Sudan to the west, and Kenya to the south. With its capital at Addis Ababa, it is also the most populous landlocked nation in the world.
Ethiopia was a monarchy for most of its history, and the Ethiopian dynasty traces its roots to the 2nd century BC. Ethiopia is also one of the oldest sites of human existence known to scientists today, having yielded some of humanity's oldest traces. It may be the region from which Homo sapiens first set out for the Middle East and points beyond. Alongside Rome, Persia, China and India, the Ethiopian Aksum Empire was considered one of the great world powers of the 3rd century. During the Scramble for Africa, Ethiopia was the only African country beside Liberia that retained its sovereignty as a recognized independent country, and was one of only four African members of the League of Nations. After a brief period of Italian occupation, Ethiopia became a charter member of the United Nations. When other African nations received their independence following World War II, many of them adopted the colors of Ethiopia's flag, and Addis Ababa became the location of several international organizations focused on Africa.

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Kenya
Kenya ( /ˈkɛnjə/ or /ˈkiːnjə/), officially the Republic of Kenya, is a country in East Africa that lies on the equator. With the Indian Ocean to its south-east, it is bordered by Tanzania to the south, Uganda to the west, South Sudan to the north-west, Ethiopia to the north and Somalia to the north-east. Kenya has a land area of 580,000 km² and a population of nearly 41 million, representing 42 different peoples and cultures. The country is named after Mount Kenya, a significant landmark and second among Africa's highest mountain peaks. Kenya's capital and largest city is Nairobi.
Kenya has a warm and humid climate along its coastline on the Indian Ocean which changes to wildlife-rich savannah grasslands moving inland towards the capital Nairobi. Nairobi has a cool climate that gets colder approaching Mount Kenya, which has three permanently snow-capped peaks. The warm and humid tropical climate reappears further inland towards lake Victoria, before giving way to temperate forested and hilly areas in the western region. The North Eastern regions along the border with Somalia and Ethiopia are arid and semi-arid areas with near-desert landscapes. Lake Victoria, the world's second largest fresh-water lake (after Lake Superior in the US and Canada) and the world's largest tropical lake, is situated to the southwest and is shared with Uganda and Tanzania. Kenya is famous for its safaris and diverse world-famous wildlife reserves such as Tsavo National Park, the Maasai Mara, Nakuru National Park, and Aberdares National Park.

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Mexico
Mexico (ⁱ/ˈmɛksɨkoʊ/; Spanish: México, IPA: [ˈmexiko] ( listen)), officially the United Mexican States (Spanish: Estados Unidos Mexicanos (help·info)), is a federal constitutional republic in North America. It is bordered on the north by the United States of America; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico. Covering almost two million square kilometres (over 760,000 sq mi), Mexico is the fifth largest country in the Americas by total area and the thirteenth largest independent nation in the world. With an estimated population of over 113 million, it is the eleventh most populous country and the most populous Spanish-speaking country. Mexico is a federation comprising thirty-one states and a Federal District, the capital city.
In Pre-Columbian Mexico many cultures matured into advanced civilizations such as the Olmec, the Toltec, the Teotihuacan, the Zapotec, the Maya and the Aztec before the first contact with Europeans. In 1521, Spain conquered and colonized the territory from its base in México-Tenochtitlan, which was administered as the Viceroyalty of New Spain. This territory would eventually become Mexico as the colony's independence was recognized in 1821. The post-independence period was characterized by economic instability, the Mexican-American War and territorial cession to the United States, a civil war, two empires and a domestic dictatorship. The latter led to the Mexican Revolution in 1910, which culminated with the promulgation of the 1917 Constitution and the emergence of the country's current political system. Elections held in July 2000 marked the first time that an opposition party won the presidency from the Institutional Revolutionary Party.

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Mississippi
Mississippi (ⁱ/ˌmɪsɨˈsɪpi/) is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi ("Great River"). Mississippi is the 32nd most extensive and the 31st most populous of the 50 United States. The state is heavily forested outside of the Mississippi Delta area, which was cleared for cotton cultivation in the 19th century. Today, its catfish aquaculture farms produce the majority of farm-raised catfish consumed in the United States. The state symbol is the magnolia grandiflora tree.
Mississippi is bordered on the north by Tennessee, on the east by Alabama, on the south by Louisiana and a narrow coast on the Gulf of Mexico and on the west, across the Mississippi River, by Louisiana and Arkansas.
In addition to its namesake, major rivers in Mississippi include the Big Black River, the Pearl River, the Yazoo River, the Pascagoula River, and the Tombigbee River. Major lakes include Ross Barnett Reservoir, Arkabutla Lake, Sardis Lake and Grenada Lake. The largest lake in Mississippi is Grenada Lake.

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New South Wales
Coordinates: 32°0′S 147°0′E / 32°S 147°E / -32; 147
New South Wales (abbreviated as NSW) is a state of Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales encompasses the whole of the Australian Capital Territory. The state capital is Sydney, which is also the state's most populous city. As of June 2010^[update], the estimated population was 7,238,819, which was 34.5% of the population of Australia, making it Australia's most populous state. Inhabitants of New South Wales are referred to as New South Welshmen.
The colony of New South Wales was founded in 1788 and originally comprised much of the Australian mainland, as well as Van Diemen's Land, Lord Howe Island and Norfolk Island, in addition to the area currently referred to as the state of New South Wales, which was formed during Federation in 1901. New Zealand briefly became a part of New South Wales when it was annexed by Britain in 1840. During the 19th century, large areas were successively separated to form the British colonies of Tasmania (established as a separate colony named Van Diemen's Land in 1825), South Australia (1836), Victoria (1851) and Queensland (1859).

wn.com/New_South_Wales
Nigeria
Nigeria ⁱ/naɪˈdʒɪəriə/, officially the Federal Republic of Nigeria, is a federal constitutional republic comprising 36 states and its Federal Capital Territory, Abuja. The country is located in West Africa and shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in the north. Its coast in the south lies on the Gulf of Guinea on the Atlantic Ocean. The three largest and most influential ethnic groups in Nigeria are the Hausa, Igbo and Yoruba.
In terms of religion Nigeria is roughly split half and half between Muslims in the North and Christians in the South; a very small minority practice traditional religion. Since 2002 there have been a spate of clashes, particularly in the North of the country, between government forces and the Islamists Boko Haram, militant jihadists who seek to establish sharia law.
The people of Nigeria have an extensive history. Archaeological evidence shows that human habitation of the area dates back to at least 9000 BCE. The area around the Benue and Cross River is thought to be the original homeland of the Bantu migrants who spread across most of central and southern Africa in waves between the 1st millennium BC and the 2nd millennium.

wn.com/Nigeria
Queensland
Coordinates: 23°0′S 143°0′E / 23°S 143°E / -23; 143 Queensland is the second-largest and third-most populous state of Australia, located in the northeast of the country. It is bordered by the Northern Territory, South Australia and New South Wales to the west, southwest and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean. Queensland has a population of 4,580,700, concentrated along the coast and particularly in the state's South East. The state is the world's sixth largest subnational entity, with an area of 1,852,642 km2. The capital and largest city in the state is Brisbane, Australia's third largest city. Referred to as the 'Sunshine State', Queensland is home to 10 of Australia's 30 largest cities and is the nation's third largest economy.
Queensland was first occupied by Indigenous Australians and Torres Strait Islanders, who arrived at least 40,000 years ago. The first European to land in Queensland was Dutch navigator Willem Janszoon in 1607. In 1770, Lieutenant James Cook claimed the east coast of Australia for the Kingdom of Great Britain. The colony of New South Wales was founded in 1788 by Governor Arthur Phillip at Sydney; New South Wales at that time included all of what is now Queensland, Victoria and Tasmania. Queensland was explored in subsequent decades until the establishment of a penal colony at Brisbane in 1824 by John Oxley. Penal transportation ceased in 1839 and free settlement permitted in 1842. Queensland was separated from New South Wales, forming a self-governing colony, on 6 June 1859, a date now celebrated state-wide as Queensland Day. Queensland achieved statehood with the Federation of Australia on 1 January 1901.

wn.com/Queensland
Sudan
Sudan (ⁱ/suːˈdæn/ or /suːˈdɑːn/;Arabic: السودان‎, as-Sūdān), officially the Republic of the Sudan (Arabic: جمهورية السودان‎, Jumhūrīyat as-Sūdān), sometimes called North Sudan, is an Arab state in North Africa (sometimes also considered to be part of the Middle East). It is bordered by Egypt to the north, the Red Sea to the northeast, Eritrea and Ethiopia to the east, South Sudan to the south, the Central African Republic to the southwest, Chad to the west, and Libya to the northwest. The population of Sudan is a combination of indigenous inhabitants of Nile Valley, and descendants of migrants from the Arabian Peninsula. Due to the process of Arabisation common throughout the rest of the Arab World, today Arab culture predominates in Sudan. The majority of the population of Sudan adheres to Islam. The Nile divides the country between east and west sides.
The people of Sudan have a long history extending from antiquity which is intertwined with the history of Egypt. Sudan suffered seventeen years of civil war during the First Sudanese Civil War (1955–1972) followed by ethnic, religious and economic conflicts between the Muslim Arab northern Sudanese and the mostly animist and Christian Nilotes of Southern Sudan. This led to the Second Sudanese Civil War in 1983. Because of continuing political and military struggles, Sudan was seized in a bloodless coup d'état by colonel Omar al-Bashir in 1989, who thereafter proclaimed himself President of Sudan. The civil war ended with the signing of a Comprehensive Peace Agreement which granted autonomy to what was then the southern region of the country. Following a referendum held in January 2011, South Sudan seceded on 9 July 2011 with the consent of Sudan's President al-Bashir.

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Texas
Texas (ⁱ/ˈtɛksəs/) (Alibamu: Teksi ) is the second most populous and the second most extensive of the 50 United States, and the most extensive state of the 48 contiguous United States. The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in East Texas. Located in the South Central United States, Texas shares an international border with the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south, and borders the US states of New Mexico to the west, Oklahoma to the north, Arkansas to the northeast, and Louisiana to the east. Texas has an area of 268,820 square miles (696,200 km²), and a growing population of 25.7 million residents.
During the Spanish colonial rule, the area was officially known as the Nuevo Reino de Filipinas: La Provincia de Texas. Antonio Margil de Jesús was known to be the first person to use the name in a letter to the Viceroy of Mexico in July 20, 1716. The name was not popularly used in daily speech but often appeared in legal documents until the end of the 1800s.

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Uruguay
Uruguay ⁱ/ˈjʊərəɡwaɪ/, officially the Oriental Republic of Uruguay, sometimes the Eastern Republic of Uruguay; (Spanish: República Oriental del Uruguay pronounced: [re̞ˈpuβ̞lika o̞ɾje̞n̪ˈt̪al̪ d̪e̞l uɾuˈɰwai̯]) is a country in the southeastern part of South America. It is home to 3.3 million people, of whom 1.8 million live in the capital Montevideo and its metropolitan area. An estimated 88% of the population are of European ancestry.
Except for the recent union of Timoteo Domínguez Island and Argentina's Martín García Island, Uruguay's only land border is with Rio Grande do Sul, Brazil, to the north. To the west lies the Uruguay River and the estuary of the Río de la Plata to the southwest. To the southeast lies the southern part of the Atlantic Ocean. With an area of approximately 176,000 square kilometres (68,000 sq mi), Uruguay is the second-smallest nation in South America by area, after Suriname.
Colonia del Sacramento, one of the oldest European settlements in the country, was founded by the Portuguese in 1680. Montevideo was founded by the Spanish in the early 18th century as a military stronghold. Uruguay won its independence in 1811–28 following a three-way struggle between the claims of Spain, Argentina and Brazil. It is a constitutional democracy, with a president who is both the head of state and the head of government.

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The Vertisolic Order - Canadian Soil Classification Series

Vertisols are heavy textured soils with 60% or higher clay content and shrink-swell charac...

published: 14 Feb 2011

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VERTISOL VIDEO

Viedeo para el showrrom de Vertisol...

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How to Pronounce Vertisol

Learn how to say Vertisol correctly with EmmaSaying's "how do you pronounce" free tutorial...

published: 22 Nov 2012

author: Emma Saying

Vertisol Decoraciones CA

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published: 10 Oct 2012

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FITNICE Installation

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Vertilux 20 Aniversario

Vertilux es una empresa reconocida a nivel mundial que proporciona un servicio innovador c...

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Fitnice Cleaning

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Creotecc Tile Roof Hook Installation

How-to video guide for installing the Creotecc Tile Roof Hooks...

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Gambiarra no ar condicionado portatil Midea!

Agora sim o ar portatil gela como deveria!! Adaptei este tubo para que possa pegar o ar qu...

published: 18 Feb 2011

author: tiasjnd

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photo: AP / Carolyn Kaster

FILE - In this June 26, 2012 file photo, President Barack Obama speaks in Atlanta. The presidential race enters the sultry summer _ a final lull before a sprint to Election Day _ with President Barack Obama and Republican Mitt Romney neck and neck and no sign that either can break away. Both sides have money concerns _ for all the flood of cash _ as well as political worries.

Obama promises gun control early next year

Sowetan Live

20 Dec 2012

Obama held a White House news conference on Wednesday to announce that Vice President Joe Biden will lead an interagency effort to craft new gun policies. The group is expected to offer its proposals in January. “We know this is a complex issue that stirs deeply held passions and political divides,” Obama said. “But the fact that this problem is complex can no longer be an excuse for doing nothing.” ... WAKE-UP CALL ... ....(size: 6.1Kb)

photo: AP / Pablo Martinez Monsivais

President Barack Obama gestures while speaking during the his visit to the Disaster Operation Center of the Red Cross National Headquarter to discuss superstorm Sandy

Obama backs bill to ban assault weapons

The Star

19 Dec 2012

WASHINGTON. US President Barack Obama backs a new bill to revive an assault weapons ban and other new gun laws, the White House said Tuesday, fleshing out his nascent response to a shocking school massacre. Obama also called an ardently pro-gun senator who has shifted his position on firearms laws since Friday's carnage in Connecticut and has begun meeting top cabinet officials to consider his options, his spokesman Jay Carney said ... ....(size: 4.9Kb)

photo: AP / Charles Krupa

Police officers cross the road after searching a strip mall near an elementary school, which was in a lockdown, in Ridgefield, Conn., Monday, Dec. 17, 2012, after a suspicious person was seen near a train station close by.

Gunspicuous Consumption and Bio-Cultures of Violence

WorldNews.com

18 Dec 2012

Article by WN.com Correspondent Dallas Darling. "Most people reason dramatically, not quantitatively." -Oliver Wendell Holmes. On the same day that a 20-year-old, described as brilliant but remote, walked into an elementary school in Connecticut and massacred 26 children and adults, the school where I teach went on "lock-down." Four students with a handgun were arrested ... That morning before school, he had posted on Twitter and Facebook....(size: 14.0Kb)

photo: Creative Commons / Joachim Huber

Etosha's elephants belong to the group of elephants in northwestern Nambia and southern Angola.

Stupider and Still Developing an Extermination Gene

WorldNews.com

18 Dec 2012

Article by WN.com Correspondent Dallas Darling. When a Stanford geneticist, Gerald Crabtree, published a provocative and controversial new view on evolutionary change, namely that humans are actually getting dumber, he should have also added that humans are still developing an extermination gene ... Paleontologist Tim Flannery would more than likely agree with Crabtree ... Strange strings of gravel also overlaid some bones ... (1) Kane, Alex ... 195....(size: 9.4Kb)

photo: AP / Narciso Contreras

In this Monday, Dec. 17, 2012 photo, a man runs between debris after a mortar shell hit a street killing several people in the Bustan Al-Qasr district of Aleppo, Syria.

U.N. seeks $1.5 billion to address Syria crisis

The Star

19 Dec 2012

GENEVA (Reuters) - The United Nations appealed on Wednesday for $1.5 billion (920.1 million pounds) to provide life-saving aid to Syrians suffering from a "dramatically deteriorating" humanitarian situation ... "The magnitude of this humanitarian crisis is indisputable," said Radhouane Nouicer, U.N ... Inside Syria, U.N ... ....(size: 1.5Kb)

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Foundation Problems Don’t Wash Away With Rain, Says Perma-Pier

Business Wire

16 May 2012

Texas-based company understands the impact of the wet-dry cycle on soil ... Even as spring showers begin to pour, rain is potentially as destructive to the already fragile Texas soils as the drought, says Perma-Pier Foundation Repair of Texas. The vertisol clay soil which runs through the regions of the Dallas-Fort Worth Metroplex, Austin, San Antonio and Houston is notorious for expanding when wet and contracting when dried ... ... Contacts ... ....(size: 7.3Kb)

Marrone biofungicide approved in Turkey

The Business Review

24 Nov 2010

Sacramento Business Journal - by Melanie Turner Date. Wednesday, November 24, 2010, 2.58pm PST. A biofungicide produced by Marrone Bio Innovations Inc. has been registered for use on greenhouse tomatoes in Turkey, the Davis company announced Wednesday. The product, which fights diseases that inflict tomatoes, is marketed under the name Vertisol by agricultural distributor Boyut Dis Ticaret Ltd. of Istanbul ... You're almost there... Comments ... ....(size: 11.1Kb)

Gas plant commitment hailed as birth of new industry

Australian Broadcasting Corporation

01 Nov 2010

Farmers are extremely worried about the future of rich farming land in the region, particularly soils known as vertisols. Vertisols have a high clay content, they swell when wet, are subject to compaction and go rock hard when they dry out ... However, she says the vertisols may be difficult to rehabilitate and this could take many years beyond the life of the CSG projects....(size: 4.0Kb)

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Vertisol

a Vertisol profile

Used in:	WRB, USDA soil taxonomy
WRB code:	VR
Profile:	OAC
Key process:	clay pedoturbation
Climate:	tropical savanna, semi-arid

In both the FAO and USA soil taxonomy, a vertisol is a soil in which there is a high content of expansive clay known as montmorillonite that forms deep cracks in drier seasons or years. Alternate shrinking and swelling causes self-mulching, where the soil material consistently mixes itself, causing vertisols to have an extremely deep A horizon and no B horizon. (A soil with no B horizon is called an A/C soil). This heaving of the underlying material to the surface often creates a microrelief known as gilgai.

Vertisols typically form from highly basic rocks, such as basalt, in climates that are seasonally humid or subject to erratic droughts and floods, or to impeded drainage. Depending on the parent material and the climate, they can range from grey or red to the more familiar deep black (known as "black earths" in Australia, "black gumbo" in East Texas, and "black cotton" soils in East Africa).

Vertisols are found between 50°N and 45°S of the equator. Major areas where vertisols are dominant are eastern Australia (especially inland Queensland and New South Wales), the Deccan Plateau of India, and parts of southern Sudan, Ethiopia, Kenya, and Chad (the Gezira), and the lower Paraná River in South America. Other areas where vertisols are dominant include southern Texas and adjacent Mexico, northeast Nigeria, Thrace, New Caledonia and parts of eastern China.

The natural vegetation of vertisols is grassland, savanna, or grassy woodland. The heavy texture and unstable behaviour of the soil makes it difficult for many tree species to grow, and forest is uncommon.

The shrinking and swelling of vertisols can damage buildings and roads, leading to extensive subsidence. Vertisols are generally used for grazing of cattle or sheep. It is not unknown for livestock to be injured through falling into cracks in dry periods. Conversely, many wild and domestic ungulates do not like to move on this soil when inundated. However, the shrink-swell activity allows rapid recovery from compaction.

When irrigation is available, crops such as cotton, wheat, sorghum and rice can be grown. Vertisols are especially suitable for rice because they are almost impermeable when saturated. Rainfed farming is very difficult because vertisols can be worked only under a very narrow range of moisture conditions: they are very hard when dry and very sticky when wet. However, in Australia, vertisols are highly regarded, because they are among the few soils that are not acutely deficient in available phosphorus. Some, known as "crusty vertisols", have a thin, hard crust when dry that can persist for two to three years before they have crumbled enough to permit seeding.

In the USA soil taxonomy, vertisols are subdivided into:

Aquerts: Vertisols which are subdued aquic conditions for some time in most years and show redoximorphic features are grouped as Aquerts. Because of the high clay content, the permeability is slowed down and aquic conditions are likely to occur. In general, when precipitation exceeds evapotranspiration, ponding may occur. Under wet soil moisture conditions, iron and manganese are mobilized and reduced. The manganese may be partly responsible for the dark color of the soil profile.

Cryerts (not classified as vertisols in the FAO classification): They have a cryic soil temperature regime. Cryerts are most extensive in the grassland and forest-grassland transitions zones of the Canadian Prairies and at similar latitudes in Russia.

Xererts: They have a thermic, mesic, or frigid soil temperature regime. They show cracks that are open at least 60 consecutive days during the summer, but are closed at least 60 consecutive days during winter. Xererts are most extensive in the eastern Mediterranean and parts of California.

Torrerts: They have cracks that are closed for less than 60 consecutive days when the soil temperature at 50 cm is above 8°C. These soils are not extensive in the U.S., and occur mostly in west Texas, New Mexico, Arizona, and South Dakota, but are the most extensive suborder of Vertisols in Australia.

Usterts: They have cracks that are open for at least 90 cumulative days per year. Globally, this suborder is the most extensive of the Vertisols order, encompassing the Vertisols of the tropics and monsoonal climates in Australia, India, and Africa. In the U.S. the Usterts are common in Texas, Montana, Hawaii, and California.

Uderts: They have cracks that are open less than 90 cumulative days per year and less than 60 consecutive days during the summer. In some areas, cracks open only in drought years. Uderts are of small extent globally, being most abundant in Uruguay and eastern Argentina, but also found in parts of Queensland and the "Black Belt" of Mississippi and Alabama.

References [link]

"Vertisols". USDA-NRCS. http://soils.usda.gov/technical/classification/orders/vertisols.html. Retrieved 2006-05-14.
"Vertisols". University of Florida. Archived from the original on 2007-12-27. http://web.archive.org/web/20071227052053/http://grunwald.ifas.ufl.edu/Nat_resources/soil_orders/vertisols.htm. Retrieved 2006-05-14.
"Vertisols". University of Idaho. http://soils.ag.uidaho.edu/soilorders/vertisols.htm. Retrieved 2006-05-14.

This page contains text from Wikipedia, the Free Encyclopedia - http://en.wikipedia.org/wiki/Vertisol

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