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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.
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 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.
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
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).
Soil colors range from the common browns, yellows, reds, grays, whites, and blacks to rare soil colors such as greens and blues. Figure 1 Relative sizes of sand, silt, clay.
Color development and distribution of color within a. soil profile are part of weathering. As rocks containing iron or manganese weather, the elements oxidize. Iron forms small crystals with a yellow or red color, organic matter decomposes into black humus, and manganese forms black mineral deposits.
