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Measurement of soil color




Paul, E. A., author
Shields, J. A., author
St. Arnaud, R. J., author
Clayton, J. S., author
Agricultural Institute of Canada, publisher

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The color of cultivated surface samples from Chernozemic and Gray Wooded soils were measured by visual and spectroreflectance methods. Variations in visual color measurements among different observers were of sufficient magnitude to represent serious errors in the application of the soil color criteria outlined in the Canadian soil classification system. Spectroreflectance measurements facilitated the accurate measurement and characterization of the Munsell renotations of Chernozemic and Gray Wooded soils sampled within their respective soil zones. The ratio of renotation value: renotation chroma of the Chernozemic samples (air-dry) were distinctly lower than those of the Gray Wooded samples. The presence of moisture caused a greater decrease in the renotation value of the Gray Wooded samples than it did in the Chernozemic samples. The renotation hue of most of the measured samples occurred midway between the 10YR and 2.5Y hue charts currently available in the Munsell soil color chart series. Color measurement of cultivated surface soil samples taken within the various soil zones of Saskatchewan indicated discrepancies between their renotation values and the color criteria currently suggested by the National Soil Survey Committee of Canada for the respective soils at the Order and Great Group levels.


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soil formation


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