AskDefine | Define soil

Dictionary Definition



1 the state of being covered with unclean things [syn: dirt, filth, grime, stain, grease, grunge]
2 the part of the earth's surface consisting of humus and disintegrated rock [syn: dirt]
3 material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use); "the land had never been plowed"; "good agricultural soil" [syn: land, ground]
4 the geographical area under the jurisdiction of a sovereign state; "American troops were stationed on Japanese soil" [syn: territory] v : make soiled, filthy, or dirty; "don't soil your clothes when you play outside!" [syn: dirty, begrime, grime, colly, bemire] [ant: clean]

User Contributed Dictionary



  • /sɔɪl/, /sOIl/
  • Rhymes with: -ɔɪl


  1. A mixture of sand and organic material, used to support plant growth.
  2. The unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants.
  3. The unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of genetic and environmental factors of: climate (including water and temperature effects), and macro- and microorganisms, conditioned by relief, acting on parent material over a period of time. A product-soil differs from the material from which it is derived in many physical, chemical, biological, and morphological properties and characteristics.
  4. uncountable euphemistic Faeces or urine etc. when found on clothes.
  5. In medical terms, a bag containing soiled items.
  6. Country or territory.
    The refugees returned to their native soil.



mixture of sand and organic material
  • Chinese: 泥土 (nítǔ)
  • Czech: půda
  • Danish: jord
  • Dutch: grond
  • Finnish: multa
  • French: sol
  • German: Boden
  • Hungarian: föld, talaj
  • Indonesian: tanah
  • Italian: suolo
  • Japanese: (つち, tsuchi)
  • Kurdish:
    Sorani: خاک
  • Malayalam: മണ്ണ് (maNNu)
  • Portuguese: solo
  • Russian: земля, почва
  • Spanish: suelo
  • Swedish: jord
mineral or organic material serving as a natural medium for the growth of land plants
  • Czech: půda
  • Danish: jord , muldjord
  • Dutch: aarde, grond
  • Finnish: maa
  • Hungarian: táptalaj
  • Italian: terreno
  • Portuguese: solo, terra
  • Russian: почва
  • Swedish: jord
unconsolidated mineral or organic material on the immediate surface of the earth
  • Danish: jord
  • Dutch: aarde, grond
  • Finnish: maa
  • Portuguese: solo
  • Russian: почва
  • Swedish: jord
faeces or urine etc.
bag containing soiled items
country or territory
  • Danish: grund
  • Dutch: grond
  • Finnish: maaperä
  • Portuguese: solo
  • Russian: земля
  • Swedish: jord, mark

See also


  1. To make dirty.
  2. To dirty one's clothing by accidentally defecating while clothed.
  3. reflexively: to soil oneself
  4. To make invalid, to ruin.


to make dirty
to make invalid, to ruin
  • Persian: (xâki kardan)



  1. bald




  1. rice

Extensive Definition

Soil is the naturally occurring, unconsolidated or loose covering of broken rock particles and decaying organic matter (humus) on the surface of the Earth, capable of supporting life. In simple terms, soil has three components: solid, liquid, and gas. The solid phase is a mixture of mineral and organic matter. Soil particles pack loosely, forming a soil structure filled with voids. The solid phase occupies about half of the soil volume. The remaining void space contains water (liquid) and air (gas). Soil is also known as earth: it is the substance from which our planet takes its name.


Soil color is the first impression one has when viewing soil. Striking colors and contrasting patterns are especially memorable. The Red River in Louisiana carries sediment eroded from extensive reddish soils like Port Silt Loam in Oklahoma.
Soil color results from chemical and biological weathering. As the primary minerals in parent material weather, the elements combine into new and colorful compounds. Iron forms secondary minerals with a yellow or red color; organic matter decomposes into brown compounds; and manganese, sulfur and nitrogen can form black mineral deposits.
Soil structure is the arrangement of soil particles into aggregates. These may have various shapes, sizes and degrees of development or expression.
Soil texture refers to sand, silt and clay composition. Sand and silt are the product of physical weathering while clay is the product of chemical weathering. Clay content is particularly influential on soil behavior due to a high retention capacity for nutrients and water.


Soil formation, or pedogenesis, is the combined effect of physical, chemical, biological, and anthropogenic processes on soil parent material resulting in the formation of soil horizons. Soil is always changing. The long periods over which change occurs and the multiple influences of change mean that simple soils are rare. While soil can achieve relative stability in properties for extended periods of time, the soil life cycle ultimately ends in soil conditions that leave it vulnerable to erosion. Little of the soil continuum of the earth is older than Tertiary and most no older than Pleistocene. Despite the inevitability of soils retrogression and degradation, most soil cycles are long and productive. How the soil "life" cycle proceeds is influenced by at least five classic soil forming factors: regional climate, biotic potential, topography, parent material, and the passage of time.
An example of soil development from bare rock occurs on recent lava flows in warm regions under heavy and very frequent rainfall. In such climates plants become established very quickly on basaltic lava, even though there is very little organic material. The plants are supported by the porous rock becoming filled with nutrient bearing water, for example carrying dissolved bird droppings or guano. The developing plant roots themselves gradually breaks up the porous lava and organic matter soon accumulates but, even before it does, the predominantly porous broken lava in which the plant roots grow can be considered a soil.

In nature

Biogeography is the study of spatial variations in biological communities. Soils are a restricting factor as to what plants can grow in which environments. Soil scientists survey soils in the hope of understanding controls as to what vegetation can and will grow in a particular location
Geologists also have a particular interest in the patterns of soil on the surface of the earth. Soil texture, color and chemistry often reflect the underlying geologic parent material and soil types often change at geologic unit boundaries. Buried paleosols mark previous land surfaces and record climatic conditions from previous eras. Geologists use this paleopedological record to understand the ecological relationships in past ecosystems. According to the theory of biorhexistasy, prolonged conditions conducive to forming deep, weathered soils result in increasing ocean salinity and the formation of limestone.
Geologists use soil profile features to establish the duration of surface stability in the context of geologic faults or slope stability. An offset subsoil horizon indicates rupture during soil formation and the degree of subsequent subsoil formation is relied upon to establish time since rupture.
Soil examined in shovel test pits is used by archaeologists for relative dating based on stratigraphy (as opposed to absolute dating). What is considered most typical is to use soil profile features to determine the maximum reasonable pit depth than needs to be examined for archaeological evidence in the interest of cultural resources management.
Soils altered or formed by man (anthropic and anthropogenic soils) are also of interest to archaeologists. An example is Terra preta do Indio.


Soil material is a critical component in the mining and construction industries. Soil serves as a foundation for most construction projects. Massive volumes of soil can be involved in surface mining, road building, and dam construction. Earth sheltering is the architectural practice of using soil for external thermal mass against building walls.
Soil resources are critical to the environment, as well as to food and fiber production. Soil provides minerals and water to plants. Soil absorbs rainwater and releases it later thus preventing floods and drought. Soil cleans the water as it percolates. Soil is the habitat for many organisms.
Waste management often has a soil component. Septic drain fields treat septic tank effluent uses aerobic soil processes. Landfills use soil for daily cover.
Organic soils, especially peat, serve as a significant fuel resource.
Both humans in many cultures and animals occasionally eat soil.


Land degradation is a human induced or natural process which impairs the capacity of land to function. Soils are the critical component in land degradation when it involves acidification, contamination, desertification, erosion, or salination.
While soil acidification of alkaline soils is beneficial, it degrades land when soil acidity lowers crop productivity and increases soil vulnerability to contamination and erosion. Soils are often initially acid because their parent materials were acid and initially low in the basic cations (calcium, magnesium, potassium, and sodium). Acidification occurs when these elements are removed from the soil profile by normal rainfall or the harvesting of crops. Soil acidification is accelerated by the use of acid-forming nitrogenous fertilizers and by the effects of acid precipitation.
Soil contamination at low levels are often within soil capacity to treat and assimilate. Many waste treatment processes rely on this treatment capacity. Exceeding treatment capacity can damage soil biota and limit soil function. Derelict soils occur where industrial contamination or other development activity damages the soil to such a degree that the land cannot be used safely or productively. Remediation of derelict soil uses principles of geology, physics, chemistry, and biology to degrade, attenuate, isolate, or remove soil contaminants and to restore soil functions and values. Techniques include leaching, air sparging, chemical amendments, phytoremediation, bioremediation, and natural attenuation.
Desertification is an environmental process of ecosystem degradation in arid and semi-arid regions, or as a result of human activity. It is a common misconception that droughts cause desertification. Droughts are common in arid and semiarid lands. Well-managed lands can recover from drought when the rains return. Soil management tools include maintaining soil nutrient and organic matter levels, reduced tillage and increased cover. These help to control erosion and maintain productivity during periods when moisture is available. Continued land abuse during droughts, however, increases land degradation. Increased population and livestock pressure on marginal lands accelerates desertification.
Soil erosional loss is caused by wind, water, ice, movement in response to gravity. Although the processes may be simultaneous, erosion is distinguished from weathering. Erosion is an intrinsic natural process, but in many places it is increased by human land use. Poor land use practices include deforestation, overgrazing, and improper construction activity. Improved management can limit erosion using techniques like limiting disturbance during construction, avoiding construction during erosion prone periods, intercepting runoff, terrace-building, use of erosion suppressing cover materials and planting trees or other soil binding plants.
A serious and long-running water erosion problem is in China, on the middle reaches of the Yellow River and the upper reaches of the Yangtze River. From the Yellow River, over 1.6 billion tons of sediment flow each year into the ocean. The sediment originates primarily from water erosion in the Loess Plateau region of northwest China.
Soil piping is a particular form of soil erosion that occurs below the soil surface. It is associated with levee and dam failure as well as sink hole formation. Turbulent flow removes soil starting from the mouth of the seep flow and subsoil erosion advances upgradient. The term sand boil is used to describe the appearance of the discharging end of an active soil pipe.
Soil salination is the accumulation of free salts to such an extent that it leads to degradation of soils and vegetation. Consequences include corrosion damage, reduced plant growth, erosion due to loss of plant cover and soil structure, and water quality problems due to sedimentation. Salination occurs due to a combination of natural and human caused processes. Aridic conditions favor salt accumulation. This is especially apparent when soil parent material is saline. Irrigation of arid lands is especially problematic. All irrigation water has some level of salinity. Irrigation, especially when it involves leakage from canals, often raise the underlying water table. Rapid salination occurs when the land surface is within the capillary fringe of saline groundwater. Salinity control involves flushing with higher levels of applied water in combination with tile drainage..

See also


Further reading

  • Adams, J.A. 1986. Dirt. College Station, Texas : Texas A&M University Press ISBN 0890963010
  • Soil Survey Staff. (1975) Soil Taxonomy: A basic system of soil classification for making and interpreting soil surveys. USDA-SCS Agric. Handb. 436. U.S. Gov. Print. Office. Washington, DC.
  • Soil Survey Division Staff. (1999) Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18.
  • Logan, W. B., Dirt: The ecstatic skin of the earth. 1995 ISBN 1-57322-004-3
  • Faulkner, William. Plowman's Folly. New York, Grosset & Dunlap. 1943. ISBN 0-933280-51-3
  • Jenny, Hans, Factors of Soil Formation: A System of Quantitative Pedology 1941
  • Why Study Soils?
  • Soil notes
  • Photographs of sand boils.
  • Oregon State University's Soils (wiki)
  • A free schools-age educational site teaching about soil and its importance.
  • LandIS Soils Data for England and Wales a pay source for GIS data on the soils of England and Wales and soils data source; they charge a handling fee to researchers.
  • LandIS Free Soilscapes Viewer Free interactive viewer for the Soils of England and Wales
  • Geo-technological Research Paper, IIT Kanpur, Dr P P Vitkar - Strip footing on weak clay stabilized with a granular pile

External links

soil in Arabic: تربة
soil in Aymara: Laq'a
soil in Bengali: মৃত্তিকা
soil in Min Nan: Thô͘
soil in Bosnian: Tlo
soil in Bulgarian: Почва
soil in Catalan: Sòl
soil in Czech: Půda (pedologie)
soil in Welsh: Pridd
soil in Danish: Jord
soil in German: Boden (Bodenkunde)
soil in Estonian: Muld
soil in Modern Greek (1453-): Έδαφος
soil in Spanish: Suelo
soil in Esperanto: Grundo
soil in Persian: خاک
soil in French: Sol (pédologie)
soil in Galician: Solo
soil in Korean: 흙
soil in Croatian: Tlo
soil in Indonesian: Tanah
soil in Icelandic: Jarðvegur
soil in Italian: Suolo
soil in Hebrew: קרקע
soil in Kazakh: Жер
soil in Latvian: Augsne
soil in Lithuanian: Dirvožemis
soil in Hungarian: Talaj
soil in Macedonian: Почва
soil in Malayalam: മണ്ണ്
soil in Malay (macrolanguage): Tanah
soil in Dutch: Bodem
soil in Japanese: 土壌
soil in Norwegian: Jord
soil in Norwegian Nynorsk: Jord
soil in Polish: Gleba
soil in Portuguese: Solo
soil in Romanian: Sol (strat al Pământului)
soil in Quechua: Allpa
soil in Russian: Почва
soil in Simple English: Soil
soil in Slovak: Pôda
soil in Serbian: Едафски фактори
soil in Serbo-Croatian: Tlo
soil in Finnish: Maalaji
soil in Slovenian: Prst (pedologija)
soil in Swedish: Jord (mark)
soil in Tagalog: Lupa
soil in Thai: ดิน
soil in Vietnamese: Đất
soil in Tajik: Гил
soil in Turkish: Toprak
soil in Ukrainian: Ґрунти
soil in Yiddish: באדן
soil in Samogitian: Dėrva
soil in Chinese: 土壤

Synonyms, Antonyms and Related Words

abuse, acres, adobe, airspace, alluvion, alluvium, arable land, area, attaint, bedaub, befoul, begrime, belt, benasty, besmear, besmirch, besmoke, besmutch, besoil, bespatter, bestain, betray, black, blacken, blot, blotch, blow upon, blur, bole, brand, call names, censure, china clay, clay, clod, confines, contaminate, continental shelf, corridor, corrupt, country, crust, darken, daub, debauch, deceive, defame, defile, deflower, demoralize, denigrate, department, despoil, dirt, dirty, disapprove, discolor, disgrace, disparage, district, division, drabble, draggle, dregs, dry land, dust, earth, engage in personalities, environs, excrement, expose, expose to infamy, filth, force, foul, freehold, gibbet, glebe, grassland, ground, gumbo, hang in effigy, heap dirt upon, heartland, hinterland, humus, kaolin, land, landholdings, lead astray, lithosphere, loam, loess, marginal land, mark, marl, mess, milieu, mire, mislead, mold, motherland, muck, muckrake, mucky, mud, muddy, murk, nasty, neighborhood, offshore rights, part, parts, pillory, place, pollute, porcelain clay, precincts, premises, purlieus, quarter, rape, ravage, ravish, real estate, real property, red clay, refuse, region, regolith, reprimand, revile, ruin, salient, sand, scorch, sear, section, seduce, silt, singe, slubber, sludge, slur, smear, smirch, smoke, smooch, smouch, smudge, smut, smutch, sod, soilage, soilure, space, spoil, spot, stain, stigmatize, subaerial deposit, subsoil, sully, taint, tar, tarnish, terra, terra firma, terrain, territory, the country, three-mile limit, throw mud at, till, topsoil, turf, twelve-mile limit, vicinage, vicinity, vilify, violate, vitiate, waste matter, woodland, zone
Privacy Policy, About Us, Terms and Conditions, Contact Us
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2
Material from Wikipedia, Wiktionary, Dict
Valid HTML 4.01 Strict, Valid CSS Level 2.1