. The practice of silviculture : with particular reference to its application in the United States . Forests and forestry. METHODS OF MAKING THINNINGS 169 ning in a stand on good soil previously unthinned will remove approximately one-third of the cubic foot volume, while a second thinning five to eight years after the first takes out 20 to 25 per cent. As an indication of what may be obtained when stands are repeatedly thinned, the following table showing the per cent. Fig. 66. Diagram showing the arrangement of crowns in a 5° year old hardwood stand in need of a thinning. The crowns of overt
. The practice of silviculture : with particular reference to its application in the United States . Forests and forestry. METHODS OF MAKING THINNINGS 169 ning in a stand on good soil previously unthinned will remove approximately one-third of the cubic foot volume, while a second thinning five to eight years after the first takes out 20 to 25 per cent. As an indication of what may be obtained when stands are repeatedly thinned, the following table showing the per cent. Fig. 66. Diagram showing the arrangement of crowns in a 5° year old hardwood stand in need of a thinning. The crowns of overtopped trees are indicated by broken lines. Compare with Figs. 67 and 68. of the total cubic foot volimie removed in thinnings has been prepared from yield tables given in Schlich's^ Manual of Forestry and secured by Tiitti from the original tables com- piled by Wimmenauer for oak and Schwappach for Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hawley, Ralph C. (Ralph Chipman), 1880-. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
