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Trenk, Fred B. (Fred Benjamin), 1900- / Forest planting handbook
(1932)

How fast does a plantation grow?,   pp. 35-42 PDF (2.0 MB)


Page 35


            How Fast Does a Plantation Grow?
  There are many plantations of different species of trees in Wiscon-
sin which, although they are making a promising growth, are not
large enough to be measured for cubic volume growth. There are also
a few outstanding plantations made before there was much general
interest in forest planting, which offer a very reliable basis for
suggesting what we may expect from plantations made today. These
include the Walter Ware plantation of white pine near Hancock; white
and Norway pine in the Gebhardt plantation in the vicinity of Mill-
ston; white, Norway, and Scotch pine at the Nye-Hayes plantation
near Wascott; Norway and Scotch pine at Star Lake in the Northern
State Forest; and Norway spruce in the Louis Frank plantation at
Prescott. Measurements made during the summer and early fall of
1931 in all of these older plantations, and in 25 others more than 14
years of age, are used to show height and diameter growth under
varying soil conditions. The Norway spruce plantation at Prescott is
used to indicate in more detail the growth of the average tree in a
spruce plantation growing on a silt loam soil, the soil for which spruce
is best adapted.
Height Growth
  Height growth is generally- considered a site index, the quality of
the location as influenced by the soil, climate, and topography. Gen-
erally speaking, rapid height growth indicates favorable site condi-
tions, However, density, or degree of stocking has a great effect on
height growth. The greater the number of trees up to a certain max-
imum, the more rapid the height growth, but at the expense of diam-
eter growth. The method of planting and.care of the plantation after
planting affect height growth. Insufficient removing of ground cover
which allows too great root competition, too much shade, or both, re-
tards height growth. Cultivation after planting enhances it.
  The following table shows the approximate height growth which
may be expected from a stand of white, Norway, and Scotch pine in
Wisconsin up to 21 years of age for white and Scotch pine, and 23
years for Norway. It is based on measurements in six white pine
plantations, 10 Norway pine plantations, and 10 Scotch pine planta-
tions.
The author is indebted to W. W. Morris. of the State Department of Agriculture
and Market. for the information presented here on growth of plantations.
35


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