we eS ee, "oT" 
SILVICAL DESCRIPTION OF LOBLOLLY PINE. 35 
RELATION OF VOLUME TO AGE. 
Table XII shows the number of board feet in a single tree at a given 
age. The greatest growth in volume is made up to the seventieth 
year. The rate then declines quite slowly and regularly to the one 
hundred and tenth year, after which it becomes irregular and drops 
off faster, but makes good growth up to the one hundred and seven- 
tieth year, and fair growth to the two hundred and fiftieth year. 
TaBLeE XII.— Volume of loblolly pine at various periods. 
Age. | Volume. } Age. Volume. | Age. Volume. 
Years. | Board re pene a 2 | Board feet. Years. | Board feet. 
30 690 | 190 1, 200 
40 ue = 760 200 1, 255 
50 230 130 830 210 1,310 
60 315 140 900 | 220 1, 365 
70 400 150 965 230 1, 415 
80 475 |} 160 1,025. | 240 | 1, 465 
90 550 | 170 1, 085 250 | 1,515 
100 620 180 1,145 
| 
RELATION OF AGE TO HEIGHT. 
Height growth decreases rapidly from the tenth to the seventieth 
year, after which it is regular but slow to the one hundred and for- 
tieth year. After the one hundred and fortieth year height growth 
becomes too slow to be of any importance as a volume factor. 
TaBLe XIII.—AHeight of loblolly pine at various periods. 
Age. Height. | Age. — Height. Age. | Height. 
io a oo eee ee YEN 
Years. Feet. Years. Feet. | Years. Feet. 
10 12 100 P| 190 125 
20 38 110 114 || 200 125 
30 59 120 117 || 210 126 
40 75 130 119 ‘| 220 126 
50 86 | 140 a PAI 230 126 
60 94 150 122 240 127 
70 100 | 160 123 250 127 
80 104 |} 170 124 
90 108 | 180 124 
RELATION OF CLEAR LENGTH AND TOTAL HEIGHT TO DIAMETER BREASTHIGH. 
The clear length (or the distance from the ground to where the first 
green limbs occur) at first increases much more slowly with growth in 
diameter than does the height of the tree. The clear length begins to 
increase most rapidly at the point where the growth in height begins 
to drop off slightly, or at about 8 inches in diameter. ‘This rapid rate 
of increase in clear length continues until the tree is about 13 inches 
in diameter, after which it falls off rapidly, as does the height, which 
has been increasing at a uniform rate of a little over 5 feet to each 
inch of diameter growth. The growth in clear length becomes 
practically stationary when the tree is 20 inches in diameter. 
