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Definition
Range from yellow to red in a soil. |
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Lightness or darkness of a soil |
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Intensity or brightness. Example: a chroma of 0 would be a neutral gray. |
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Used to manage soil usage. It can minimize soil erosion. The classes state what factors limit the usage of each area of land. There are 8 classes and 4 subclasses that show what that limiting factor is. |
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Term
Land Capability Classes I-VIII |
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Definition
Class I is the least limited, So a class I land will be the most useful for agriculture (prime agricultural land). Class VIII is the most limited, So a class 8 land is very susceptible to damage and will be reserved for soley plant and animal use. |
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Land Capability Sub Classes |
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Definition
Sub-classes shows which each area of land is most susceptible to, and is added along with the class number. (e) erosion, (w) wetness, drainage, flooding, (s) root zone limitations, acidity, density, and shallowness, (c) climate limitations, short growing season. Example: 2e would be land that is slightly susceptible to erosion. |
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Term
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Definition
V=kr^2 The velocity is proportional to the squared k is a constant radius of each particle of soil. There is little V=velocity variation in the density of soil particles. r=radius of each particle |
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Term
Master Horizons: O horizon |
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Definition
Organic layers formed from fallen leaves and other plant and animal remains. They undergo varying transformations for this formation to occur. Referred to as the forest floor. |
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Term
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Definition
Most eroded layer, lost some materials because of translocation. This horizon is dominated by mineral particles but have been darkened by water leaching organic materials from the surface layer down into the soil. AKA: topsoil, plow layer. Usually the layer that is plowed and brought up that helps plants grow the most. |
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Term
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Definition
Zone of maximum leaching or EEEluviation. of clay, Al Fe oxides. lighter than the A horizon above it, and lighter than the B horizon below it. Common in forests, never grasslands |
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Term
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Definition
Subsoil horizon with much less organic matter. Composed of Iron, silicate clays, oxides, aluminum, gypsum, calcium carbonate. These materials accumulated from being washed down from the surface. Mostly formed by illuviation: Materials washing in from horizons above. |
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Term
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Definition
Plant roots and microorganisms extend below horizon B usually in humid regions. Chemical change in soil water occurs. Least weathered horizon of soil. |
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Term
Diagnostic Horizons: Epipedons |
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Definition
Diagnostic horizons that occur at the soil surface. The whole upper part of the soil that contains organic matter. |
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Definition
Noted for its dark color. Accumulated organic matter, |
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Term
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Definition
Organic matter, dark color, but lower saturation than mollic |
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Term
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Definition
mineral horizon not as deep as mollic or umbric. lighter in color. |
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Term
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Definition
accumulation of silicate clays |
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Term
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Definition
Accumulation of Fe and Al oxides. But low acidic silicate clays. |
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Term
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Definition
highly weathered, high in Fe and Al oxides and low-activity silicate clays. Found in tropical areas. |
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Term
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Definition
illuvial horizon with colloidal organic matter and Al oxide. Forest soils. Cool humid climates |
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Definition
light colored eluvial low in clay and oxides of Fe and Al. |
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Definition
The movement of materials or materials being washed from an upper horizon layer to a lower one.Result of Eluvation, illuviation is an accumulation of those materials leached by the process of eluviation. |
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Term
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Definition
Maximum leaching, or water seeping through the soil bringing down chemicals such as silicate clay, Al and Fe oxides. |
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Definition
The nature of the system of pores and channels in the soil. Determines the ability for the soil to hold and conduct the water and air necessary for sustaining life growing in it. Drainage; erosion susceptibility; air flow (aeration) gas transport. |
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Term
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Definition
Dirt clods, used to determine structure. Such as... shape and size |
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Term
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Definition
Water deposition: Water moving soil elsewhere. Causes some additions to the soil horizons. Example: alluvial fan: a deposit of sediment built up by a stream causing a fan shape in the soil. |
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Term
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Definition
Down slope deposition. develops at the base of a hill slope from concentration surface runoff. Consisting of silt and bigger rock fragments. Avalanches, GRAVITY. |
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Term
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Definition
Wind blown deposition, soil moved by wind. |
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Term
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Definition
Does not change is an assumed value. Drainage aeration a microbial value. |
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Term
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Definition
Mass of Dry soil/ volume of the soil cylinder
Volume of cylinder= V=(Pi*r^2)(Height) |
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Definition
fixed value used to find porosity |
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Term
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Definition
Bulk density/ Particle density (fixed value) multiply by 100 then subtract from 100. |
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Term
Jenny Equation: 5 soil forming factors |
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Definition
1. Climate: Very important in determining the environment that the soil will be forming in. Affects the types of organic materials, such as which plants will grow. It affects amount of moisture, and which soil horizons will end up forming either because of aeration or leaching. 2. Organic material: (biota) dead plants and animals, and living. Animals prevent erosion and recycle material from under the soil to the top of the soil creating organic material. 3. Relief or topography: The way the landscape is shaped or sloped affects soil formation greatly, because depending on how it is shaped can cause water to flow down a slope creating a different soil structure than if it stayed at the bottom of a slope. 4. Parent Material: The parent material is the building block of every soil formed. The type of parent material depends on the location and also depends on the other four soil forming factors. 5. Time: Very important because the longer the parent material has had to break down the more developed all the soil horizons will be. |
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Term
Soil Taxonomy: Orders
SOIL ORDER 1 |
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Definition
Gelisols: Soils with a lot of permafrost, found in the tundra. (Cryoturbation) (Root: EL) |
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Term
ORDER 2: Histosol Root= ist |
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Definition
Histosols: Very high water capacity, more than 20 percent organic matter. Very rare. Many cations |
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Term
ORDER 3: Spodosols Root= Od(s) |
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Definition
Spodosols: Acid, sandy forest soils, highly leached giving andic properties. Light upper horizons to darker yellowish lower horizons. |
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Term
ORDER 4: ANDISOLS Root: Ands |
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Definition
Volcanic ash soils. Not as much development time. high water capacity. Easily tilled, low density. Organic matter accumulation. |
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Term
ORDER 5: Oxisols Root: OX |
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Definition
Most weathered soil order. Hot moist climates. tropical rain forest. deep oxic subsurface horizon Moderatley acidic clay, and high concentrations of Al and Fe |
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Term
Order 6: Vertisols: Root: ERT |
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Definition
Dark swelling and cracking clays. subhumid/semiarid environments. rainfall moistens cracks in clay and then it expands and hardens again. almost black in color most times. |
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Term
Order 7: Mollisols Root: OLL |
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Definition
Dark solft soils of grasslands. Calcium rich organic matter. granular or crumb surface horizon. |
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Term
Order 8: alfisols Root: ALF |
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Definition
Argillic (Clay bearing) or natric horizon, moderately leached. more weathered then most soils besides spodosols and ultisols and oxisols. Mediterranean climates. deciduous forests. Less acidic clay than Ultisols. |
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Term
Order 9: Ultisols Root: ULT |
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Definition
More highly weathered than alfisols, also argillic horizons, the only difference is ultisols have acidic clay and alfisols have less acidic clay. |
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Term
Order 10 :Ardisols Root: ID like arid |
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Definition
Dry soils. Arid environments. most abundant soil next to entisols. Water deficiency. Light colored top layer (epipedon). and little to no organic matter. |
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Term
Order 11: Entisols: Root: ENT |
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Definition
Recent soils: little to no development. no B horizon. Forms in shifting sand or on steep rocky slopes. or in recent alluvium (Water deposition). |
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Term
Order 12: inceptisols Root: ept |
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Definition
Has few diagnostic characteristics. ochric or umbric epipedon, cambic horizon. |
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Term
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Definition
Based on the root of the order. Entisols= order suborder=aquents |
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Term
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Definition
Based on the root of the order. Entisols= order suborder=aquents |
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Term
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Definition
more than 400 Examples: umbric, argillic (more clay) (, and natric....) |
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Term
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Definition
more devisions of great group.... (Vermic Hapludolls ...) |
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Term
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Definition
Names are normally longer example: Loamy sandy, mixed, active, cryic... |
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Term
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Definition
.05-.002 cm particles spherical smoother than sand |
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Term
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Definition
Larger particles 2mm-0.05mm in diameter spherical, more coarse than silt and clay. |
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Term
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Definition
less than .002mm plate shaped, sticky texture. attracts cations. reacts with water causing shrinking and swelling |
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Term
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Definition
Size and shape alterations intensity of weathering can help determine soil type |
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Term
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Definition
Soil composition changes adding or loss of chemicals in the soil. |
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