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Knots in Second-growth Pine and the Desirability of Pruning

Benson H. Paul

出版	Forest Service, U.S. Department of Agriculture, 1938
URL	http://books.google.com.hk/books?id=ula_86DLkdkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

The pruning of young trees in sparsely and unevenly stocked stands will greatly improve the resulting lumber grades. In northern white and red pines, even in fully stocked stands, artificial pruning is essential for the production of any of the best grades of lumber in a reasonable time.