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Surface Soil Properties of Black Walnut Sites in Relationship to Wood Color
Author(s) -
Maeglin Robert R.,
Nelson Neil D.
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400010038x
Subject(s) - soil water , silt , organic matter , chemistry , juglans , loam , mineralogy , soil science , environmental science , geology , paleontology , biochemistry , organic chemistry
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.