Growth-Quality Evaluation of Black Walnut Wood. Part III-An Anatomical Study of Color Characteristics of Black Walnut Veneer

Because wood color is an important quality characteristic in black walnut (Juglans nigra L.), a study was devised to examine some cellular features of heartwood coloration using microspectrophotometric techniques. Five commercially prepared veneer samples exhibiting low macro-luminance (darker) and five exhibiting high macro-luminance (lighter) were chosen for microscopic color analysis. Statistically significant differences were found between the high and low macro-luminance sample groups in the micro-luminance color value in some cellular features (axial parenchyma walls, ray parenchyma walls, fiber walls, and ray parenchyma inclusions). Also observed were large differences in the dominant wavelength of ray parenchyma inclusions between the sample groups. These results suggest that quality of these coloration pigments (phenolics) is more important than quantity for overall color variations

Growth-quality evaluation of Missouri-grown shortleaf pine (Pinus echinata, Mill.)

Digitized 2007 AES.Includes bibliographical references (pages 57-59)

Pruning forest trees

"Pruning trees in both the yard and in the forst can yield many benefits--if it is done correctly."--First page.Carol B. Trokey and E.A. McGinnes, Jr. (School of Forestry, Fisheries and Wildlife, College of Agriculture)New 6/89/8

Pruning forest trees (1993)

Reviewed October 1993

X-ray Scattering and X-ray Diffraction Techniques in Studies of Gamma-Irradiated Wood

X-ray scattering and diffraction techniques were used to evaluate degradation of oak wood by gamma radiation. Samples were exposed to 650, 950, and 1,900 Megarads radiation. Chemical analyses (lignin, extractives, and holocellulose content) and density measurements were made on the irradiated samples. Results indicate that cellulose crystallinity was reduced with increasing irradiation and is destroyed at a dosage of 1,900 Megarads. Small-angle X-ray scattering studies were clarified by the use of these additional analytical methods

Growth-quality evaluation of black and scarlet oak grown in Missouri

This bulletin is a report on studies of growth-quality relationships of various commercial timber species of Missouri. The work was undertaken as a part of Project 535, supported primarily by McIntire-Stennis funds, of the school of Forestry--P. [2].Digitized 2007 AES.Includes bibliographical references (page 15)

Some Structural Changes Observed in the Transformation of Wood into Charcoal1

On the basis of measurements of microtomed cubes of white oak and on resultant charcoal, dimensional changes occurring on the conversion of wood into charcoal are: tangential, -25.68%, radial, -15.45%, and longitudinal, -11.43%. Light microscopic examination of charcoal reveals residues of combustion present in cell cavities. Electron microscopic examination indicates that the original fibrillar arrangement of the cell wall has been replaced with a smooth, "amorphous-appearing" wall structure

A Note on Effects of Sewage Effluent Irrigation on Specific Gravity and Growth Rate of White and Red Oaks

A 2.5-acre forested terrace of mixed hardwoods (predominately oak) in southern Missouri was sprinkler-irrigated with treated sewage effluent. Ninety-two oak trees were sampled (increment cores) at breast height. There were 41 white oaks and 52 red oaks. Growth rate increased significantly for white oaks and specific gravity increased significantly for red oaks

Anatomical Response and Recovery of Twigs of Juglans Nigra Following Oviposition Injury Inflicted by The Two-Spotted Treehopper, Enchenopa Biontata

Ovipositor wounds on one-, two-, and three-year-old twigs of black walnut were examined. The ireehopper's ovipositor makes a longitudinal wound, which curves tangenlially through the bark splitting the tissues along the cambial zone of first year twigs. Following oviposition in August to early October, there is some proliferation of wound periderm and callus tissue surrounding the wound. Following nymph emergence in May. extensive callus formation and cambial activity closes the wound and reestablishes the continuity of the vascular cambium. Third-year growth produces normal secondary xylem: externally a corky scar remains

A Climate History of Boone County, Missouri, From Tree-Ring Analysis of Eastern Redcedar

A ring-width index, constructed from analyses of eastern redcedar (Juniperus virginiana L.) trees, for central Boone County, Missouri, is presented. Correlations between summer temperatures, spring rainfall and the index are shown. Some possible interpretations of past climate history, based on the index, are listed for selected time periods back to 1650 AD