Surface Soil Properties of Black Walnut Sites in Relationship to Wood Color
1970
Maeglin, Robert R. | Nelson, Neil D.
Various soils that supported black walnut (Juglans nigra L.) growth in Indiana and Missouri were analyzed for surface pH, organic matter, available P, exchangeable K, Ca, Mg, total N, silt plus clay content, cation-exchange capacity (CEC), and depth to mottling or to impervious layer. Quantitative color values (luminance, dominant wavelength, purity) of heartwood of walnut trees grown on these soils were determined by reflectance spectroscopy. The soil properties analyzed were moderate to high for most soils studied. A few soils were found low in available P, silt plus clay content, and organic matter. Regression analyses indicated that variations in soil fertility were correlated with difference in wood color between individual sample trees. The range of observed site quality was rather limited, however, poorer sites showed a tendency toward darker, redder heartwood (lower luminance, higher dominant wavelength). Available P, exchangeable K, Ca, Mg, total N, and pH were found to be most important in relation to color variation.
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