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Soil organic matter and iron oxides contribute most to soil color. Organic matter darkens soil, while iron oxides produce a range of soil colors that are dependent on the oxidation state of the iron. The most widely used method for determining soil colors is comparison of soil samples with the color chips in the Munsell soil color charts.
Soil color is often the most visually apparent property of soil. While color itself does not influence the behavior or practical use of soils, [1] it does indicate important information about the soil organic matter content, mineralogy , moisture, and drainage.
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. Page: mix of colors or hue; Value: lightness or darkness; Chroma: intensity
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.
Red, brown, yellow, yellowish-red, grayish-brown, and pale red are all good descriptive colors of soil, but not very exact. Just as paint stores have pages of color chips, soil scientists use a book of color chips that follow the Munsell System of Color Notation (www.munsell.com).
15 de dic. de 2023 · Key factors influencing soil color include organic matter (which darkens the soil), calcium carbonates (resulting in a white hue), iron oxide (which can give a red or yellow color), and the size distribution of particles and aggregates (leading to a range of dark and bright colors).
1 de ene. de 2016 · Color is a passive soil property – that is, it is a consequence of soil‐forming processes and not an agent affecting soil behavior. Nevertheless, several inferences can be made as a result of observing the color of the soil. These inferences may be important in the use and management of soils.
