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Soil Composition and Color . Soil color and other properties including texture, structure, and consistence are used to . distinguish and identify soil horizons (layers) and to group soils according to the soil . classification system called . Soil Taxonomy. Color development and distribution of color within a . soil profile are part of weathering.
It varies from place to place because some factors like temperature and precipitation are the main climate factors that make soils different from one another ,the organisms living in soil and the decomposition products of plant and animal tissues and wastes also has a role in the colour and texture of the soil. Suggest Corrections.
Several forces, which soil scientists call the “factors of soil formation”, influence soil color. These include climate, parent material (sediment or rock that soil forms in), biology, landscape position, time that a soil body has been forming, and human activity. Scientists document color when studying soils, as it clues them in to how ...
Soil in anaerobic, saturated environments may appear gray or blue in color due to the redox reduction and/or depletion of iron. In an anaerobic soils, microbes reduce iron from the ferric (Fe 3+) to the ferrous (Fe 2+) form. Manganese may also be reduced from the manganic (Mn 4+) to the manganous (Mn 2+) form, though iron reduction is more ...
- Accumulation of Organic Material
- Accumulation of Materials
- Munsell Soil Color Book
Accumulation of organic material turns the soil darker, as is commonly found in the surface layers. This may be several feet in some prairie-derived soils as pictured to the left, or even the whole visible depth, especially in cases like a floodplain or footslope receiving additional materials.
Accumulations of materials, such as calcium or gypsum, can also color soil in certain circumstances. In the case of calcium or gypsum, white colors appear, frequently in the B horizon in semi-arid conditions or places on the landscape where water moves in carrying calcium, gypsum, or other salts, and evaporates off. Since the salts cannot evaporate...
Since simple color description works like “dark” or “red” won’t mean the same thing to different people, soil scientists use a standard notation to indicate a soil’s color. Soil color is formatted this way: Page/Value/Chroma Example: 10YR 2/1 1. Page:mix of colors or hue 2. Value:lightness or darkness 3. Chroma:intensity
a. To explain why soils are colored b. To be able to show that soil color is a coating c. To explain that water can change the color of the soil d. To determine how fast color can changes based on several factors Keywords soil color, iron oxides, rust, quartz, feldspar, oxidation, reduction, redox, anaerobic, aerobic Dig Deeper
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Soil color is an indicator of the hydrology (wet or dry) in soils and is classified based on (1) hue, (2) value, and (3) chroma using the Munsell color chart (Munsell Color, 2010). Hue is the overall color of the soil, such as red or yellow. Value is the lightness or darkness of the soil color and chroma is the intensity or greyness of color.
