Experiment Station Record, Volume 89, July-December, 1943 Page: 73
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1943] FORESTRY 73
In studies with 1,443 trees ranging from 5 to 48 ft. in height and from 1 to
8 in. d. b. h., it was evident that net returns were about the same whether
pruning to clear one 16-foot log was done as soon as possible without incurring
any loss in growth, or somewhat earlier with the resultant loss of about 0.4
in. in diameter growth. Still heavier and earlier pruning that caused a loss
of about 1.2 in. in diameter growth is believed less desirable. The removal
of all side branches, leaving only the leader, was definitely undesirable. Pruning
should be restricted to trees at least 18 ft. tall. As a rule, open-grown
trees should be pruned to 40 to 50 percent of their total height. If 8-foot
or similar short lengths of lumber are required, it is more profitable to clear
one 16-foot log in two operations; first, when the trees are 18 ft. high and,
second, when 34 ft. high.
Relative height growth of planted shortleaf pine and cut-back and uncut
hardwood reproduction after release, P. G. LIMING and B. F. SEIZERT. (U. S.
D. A.). (Jour. Forestry, 41 (1943), No. 3, pp. 214-216).-A study of the height
growth of planted shortleaf pine and hardwood reproduction in the Clark
National Forest of Missouri led to the conclusion that on areas where the
desired stocking of pine can be had by planting in openings in the reproduction,
it is not necessary to cut the reproduction. Because of its quicker and greater
response to release, the pine will dominate most of the hardwood reproduction
established prior to release. On areas where some pine must be planted
under hardwood reproduction in order to obtain adequate stocking, the overtopping
reproduction should be removed. However, because of the high growth
rate of the new sprouts from reproduction cut back at the time of overhead
release, later cuttings may be necessary to prevent them from overtopping
the pine.
Effect of litter removal on diameter growth of shortleaf pine, G. M.
JEMISON. (U. S. D. A.). (Jour. Forestry, 41 (1943), No. 3, pp. 213-214).Over
a period of years, all litter down to the mineral soil was removed annually
from a half-acre plat. Increment core data taken in dominant and codominant
shortleaf pines showed that, in trees from slightly over 10 in. to 13 in. d. b. h.,
raking had significantly reduced growth. However, from a practical viewpoint
the reduction was not important and might well be offset by the value of the
needles as mulch or litter.
Susceptibility of Japanese larch and jack pine to deer browsing, A. B.
RECKNAGEL. (Cornell Univ.). (Jowr. Forestry, 41 (1943), No. 3, p. 216).-Observations
in September 1942 in a planting of 2-1 stock of Japanese larch and
jack pines established in May 1940 on a dry area in the Arnot Forest near
Ithaca, N. Y., showed the Japanese larch to be free of browsing injury, although
34 percent of the trees had died, apparently from drought. The balance was
vigorous and making good height growth. The jack pines, on the other hand,
suffered severely from browsing, 34 percent being seriously injured.
Operating small sawmills in wartime, C. J. TELFORD. (Coop. Univ. Wis.).
(U. S. Dept. Agr., Misc. Pub. 509 (1943), pp. 424-, ills. 24).-The important
role of small sawmills in expanding the production of lumber needed for war
'purposes is stressed, and information is given as to the sizes of timber that
should be cut for mills, the structure and operation of mills, handling and treatment
of lumber, and on sawmill accounting. Plans for two small sawmills of
portable type and for a semipermanent mill are included.
Wood for war emergency fuel, R. H. PECK (Missouri Sta. Cir. 246 (1942),
pp. [4].-The author briefly discusses the fuel value of Missouri tree species,
how to cut and season fuel wood, and its efficient use and advantages.
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 89, July-December, 1943, book, 1944; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5067/m1/87/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.