Soil colors are used to infer pedogenic processes in soils. The main pigmenting (coloring) agents in soils are organic matter, iron, and, to a lesser extent, manganese. When these agents are not covering the mineral grains, the natural color of the grains is visible. Most mineral grains are naturally gray. The contrast of color is shown in Figures 3 and 4, where two soils have similar texture and structure yet differ in color scheme. When a soil horizon has more than one color, the dominant color by volume is the matrix color
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Soil Color
Soil colors are used to infer pedogenic processes in soils. The main pigmenting (coloring) agents in soils are organic matter, iron, and, to a lesser extent, manganese. When these agents are not covering the mineral grains, the natural color of the grains is visible. Most mineral grains are naturally gray. The contrast of color is shown in Figures 3 and 4, where two soils have similar texture and structure yet differ in color scheme. When a soil horizon has more than one color, the dominant color by volume is the matrix color
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