Timber Growing and Logging Practice in the Northeast: Measures Necessary to Keep Forest Land Productive and to Produce Full Timber Crops. Page: 43

                                
TIMBER GROWING IN THE NORTHEAST              43
which may be of minor importance to older trees but are of major
importance to the young seedlings.
The mean annual growth at different ages is shown in cords of
peeled pulpwood in Figure 11 and in board feet of saw-log material
in Figure 12. For average sites pulpwood reaches its maximum at
65 years, saw timber at 82 years. To produce the greatest amount of
high-quality lumber, however, would undoubtedly require considerably
longer than 82 years, since natural pruning of spruce does
not take place at an early age.
BOARO
ElT
S0
400
Pooo .
I00 -~
            ----
-M00
5o                   7 0   75  0 9  00 7  o0  95
AOC-YEARS
PIGu      e 12-Mean annual growth of fulr oekd stman of econd-growth red spree
in board feet per cr
The annual growth of pulpwood material as measured at 10-year
intervals reaches its maximum at about 45 years, and the annual
growth of saw-log material at 60 year. At these ages the periodic
annual growth is as shown in Table 9.
TABL 9.-Per*o  asual rowth of ptulwoo4 od s o-g mteral in their
rfpeots   veear of N4mw1NeB period o rawrua grow
,ood A,,r

-Pw

  odc .    't .tte                     site
.Illpoodmr t^ W-V W-

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                    L740    1.1
lo' sg                 asr*  Y u  --
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1.   740  325__    -
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