Value
Definition
The lightness dimension of the Munsell system, scaled from 0 (theoretical black) to 10 (theoretical white). High-organic soils tend to have low value (dark); bleached or high-quartz soils have high value (pale).
- Scale range
- 0 (black) to 10 (white)
- Organic-rich soils
- Typically value 2-4 (dark)
- Bleached soils
- High value (pale)
Common questions
What does Value mean in the Munsell system?+
Value is the lightness component of Munsell notation. It runs from 0 (black) to 10 (white) and tells you how dark or light a soil sample appears. A soil with low value (2-4) looks dark, while a soil with high value looks pale.
Why do soils with high organic matter have low value?+
Organic matter in soil, like decomposed plant material and humus, is dark brown or black. Soils rich in this organic content naturally appear darker, so they get low value ratings in the Munsell scale.
Which soils have high value in Munsell notation?+
Bleached soils and soils high in quartz minerals have high value because they appear pale or light. These are typically soils with less organic matter and more mineral content.
Related terms
- Chroma
- The saturation or colourfulness of the hue, from 0 (neutral grey) outward in whole-number steps. Strongly weathered, iron-oxide-rich soils have high chroma;...
- Hue
- The dominant wavelength family of a colour, expressed as a position on the Munsell colour wheel. Soil hues run from 10R (red)...
- A Horizon
- The uppermost mineral soil horizon, darkened by organic matter accumulation and the layer most commonly transferred by footwear and vehicle contact.
- Clay Mineral
- A secondary phyllosilicate mineral produced by chemical weathering; includes kaolinite, illite, smectite, and chlorite, all diagnostic of parent material and weathering intensity.
- Inter-Observer Variability
- The tendency of different trained examiners to assign slightly different Munsell codes to the same sample. Research has shown this can span...
- Loss on Ignition (LOI)
- Weight loss after heating dried soil to 550 degrees Celsius. Approximates the organic matter content. A simple, cheap, high-yield discriminator in field...
- Munsell Chip Comparison
- The visual procedure of matching a soil sample against printed colour chips in the Munsell Soil Colour Chart under standard daylight conditions,...
- Munsell Notation
- A three-component colour code (Hue-Value/Chroma) standardised under ASTM D1535 for describing soil colour from the Munsell Soil Colour Chart.
- Munsell Soil Colour Chart
- A physical book of matt colour chips arranged by hue, value, and chroma, published by X-Rite/Munsell Color. The analyst holds a chip...
- Particle-Size Distribution
- The quantitative measurement of the proportions of gravel, sand, silt, and clay in a soil sample, determined by sieving and hydrometer or...
- Soil Texture
- The relative proportions of sand, silt, and clay in the mineral fraction of a soil, expressed as a USDA or ISSS texture...
- Spectrophotometry
- Instrumental measurement of reflectance at each wavelength across the visible spectrum, producing a numerical colour profile. Results can be expressed in CIE...
Explained in these topics
- Soil Colour and Munsell NotationThe lightness dimension of the Munsell system, scaled from 0 (theoretical black) to 10 (theoretical white). High-organic soils tend to have low value (dark); b...
- Soil Composition, Classification and the Munsell SystemThe lightness component of Munsell notation, from 0 (black) to 10 (white); soils high in organic matter have low value ratings of 2-4.