The Mensell Soil Color Chart is based on the Mensell Color System and the Mensell Color Nomenclature, combined with the characteristics of the soil color, used to determine and describe the standard color chart of the soil color. The Munsell color system is based on the three properties of color, namely hue, color value, and chromaticity. Hue refers to the color that the object presents, that is, the dominant spectral color. There are 10 basic colors, of which 5 main colors, namely R (red), Y (yellow), G (green), B (blue), P (purple); 5 auxiliary colors, namely YR (yellow red), GY (greenish yellow), BG (blue-green), PB (purple blue), RP (red purple). Then divide 4 levels by 2.5, such as 2.5YR, 7.5YR, 10YR, etc. The color value refers to the relative brightness of the soil color, with achromatic (N) as the reference, absolute black (ideal black) as 0, and absolute white (ideal white) as 10, divided into 0-10 from dark to bright. Equally divided. Chromaticity refers to the relative purity or intensity of the spectral color. It is divided into 0 to 10 from weak to strong, and the higher the chroma, the more intense the color. The order of color naming is hue, color value, and chromaticity. For example, if the tone of a soil is 2.5Yh, the color value is 4, and the chromaticity is 6, the nomenclature is 2.5YR4/6. The complete nomenclature of the soil color is the color name of the ten-door color, such as red brown (2.5YR4/6), brown ash (10YR6/1) and so on. When used, the soil color can be determined and recorded by comparing a soil sample with a card with a standard color scale.
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