38 WORKING PLAN, LANDS IN BERKELEY COUNTY, 8. OC. 
Up to about 90 years of age a little over five years is required to grow 
1 inch in diameter. Beyond that point the rate of growth becomes 
very slow. 
A comparison of this table with the one for loblolly pine will show 
that the diameter growth of longleaf for the first seventy years is 
only about one-half as fast as loblolly. At 100 years old, however, it 
has reached a diameter three-fifths that of loblolly of the same age, 
and during its second century of life it almost keeps pace with the 
loblolly. 
TaBLE X VI.—Age of longleaf pine. 
Diam- | | Diam- Diam- Diam- 
< eter | | eter eter eter 
breast-| “8©- || breast-| 48®- | breast-- 48°: | breast-| “8° 
high. | || high. |) high. | high. | 
a ze | | ee eee 
| i | | | 
Inches. | Years. || Inches. Years. | Inches. Years. | Inches.| Years. 
| Loe 9 62 17 114 2b) Wit e220 
D 24 10 67 18 125 26 235 
3 30 11 72 19 137 Paihe i Ost 
4 30 || 12 78 | 20 150 28 267 
5 40 13 83 | 7A 164 29 Ay n28o 
6 | 46 || 14 89 22 L177 ji 30 299 
ay) 52 15 96 23 191. || 
8 De Hit 16 105 | 24 206 || 
| II 
RELATION OF VOLUME TO AGE. 
(See Table XVII. ) 
In the case of longleaf pine sixty years must elapse before the mer- 
chantable contents of a tree become great enough to be considered. 
From this point the annual increment in volume continues to increase 
in amount to about the one hundredth year, between which and the 
one hundred and thirtieth year it makes a marked drop. Thencefor- 
ward it remains fairly uniform, though fluctuating somewhat one way 
or the other. 
TaBLe X VII.— Volume of longleaf pine at various periods. 
Age. Volume. Age. | Volume, Age. Volume. 
| 
Years. Board feet. | Years. | Board feet. Years. | Board feet. 
60 30 130 | 295 200 500 
70 70 140 325 210 | 925 | 
80 110 150 | 355 220 | 555 
90 150 || 160 | 385 230 580 
100 190 170 | 415 240 | 610 | 
110 225 180 445 250 | 635 
120 260 190 470 | 
RELATION OF AGE TO HEIGHT. 
(See Table X VIII.) 
Height growth of longleaf pine is greatest from the tenth to the 
thirtieth year, but continues to be rapid to the eightieth year. After 
this it rapidly drops, until at 120 years the tree is growing only one- 
tenth of a foot per year. It continues at about this rate up to two 
hundred years, after which it practically stops. 
