Calculation of Soil Color from Reflectance Spectra1
- R. N. Fernandez and
- D. G. Schulze2
Procedures were developed for obtaining visible spectra of dry and moist soil powders on a Cary 17D spectrometer. Accuracy and precision were checked by measuring the colors of: (i) 28 chips of the Inter-Society Color Council-National Bureau of Standards (ISCC-NBS) Centroid Color Chart, (ii) 279 chips of the Munsell Soil Color Chart, and (iii) 12 selected soil samples. Measured Munsell values were not significantly different from nominal values. Measured hue and chroma were significantly different from nominal hue and chroma, but the difference was approximately 0.25 units of chroma and, thus, is relatively small. Average deviations for duplicate measurements of Munsell hue, value, and chroma of 12 silt loam and silty clay loam soil samples were <0.1 unit of hue, value, or chroma and maximum deviations were <0.2 units. Precision was similar for both dry and moist samples. Increased accuracy and precision make it possible to quantify small differences in soil color that are difficult to quantify using only visual color matching.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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