LIFE HISTORY OF SHORTLEAF PINE. 
41 
table. Tables 16, 17, and 18 have been thus prepared by measuring 
portions of well-stocked second-growth or old-field stands of known 
age and quality of natural environment, particularly character of soil 
and moisture supply. For example, the average yield of 50-year-old 
stands on the best class of sites in North Carolina (Table 16) is about 
23,700 board feet, on medium or average sites 17,000, and on the 
poorest sites about 10,300 board feet. Table 18 shows yields in the 
Arkansas region at 50 years of 37,200, 23,750, and 12,200 board feet, 
respectively, on the three qualities of site. The original figures for 
North Carolina were secured from 80 selected sample tracts with an 
area of 21.6 acres, which may be considered fairly representative. 
The data for Table 18 are insufficient in amount, hence the table is 
tentative and has been included for the purpose of comparison and 
correction when more measurements become available. 
Table 16. — Yield of well-stocked second-growth shortleaf pine in North Carolina. 1 
[Based on 80 sample plots in well-stocked stands; total area, 21.6 acres. Saw timber scaled to 6 inches in 
top diameter; stump height, 1 to 1.5 feet. Volume of stem is from 1-foot stump to 6-inch top diameter, 
including bark. All trees 6 inches and over diameter breast high were scaled.] 
QUALITY I. 
Age (years). 
Trees 
Average 
diameter 
Average 
Total 
basal 
area. 
per acre. 
breast 
high. 
height. 
Inches. 
Feet. 
Sq. ft. 
2,940 
2.8 
22 
104 
1,760 
4.4 
32 
135 
1,000 
5.8 
40 
158 
675 
6.9 
46 
175 
510 
7.9 
51 
188 
410 
8.8 
55 
198 
340 
9.6 
59 
205 
280 
10.4 
63 
211 
235 
11.2 
66 
215 
200 
11.9 
69 
218 
165 
12.7 
72 
220 
140 
13.4 
74 
222 
120 
14.1 
77 
224 
100 
14.7 
79 
226 
90 
15.3 
81 
227 
Yield per acre. 
Saw timber. 
Scribner 
Doyle 
rule. 
rule. 
Bd.ft. 
Bd. ft. 
400 
3,000 
300 
5,700 
2,000 
8,400 
3,600 
11, 200 
5,300 
14,000 
7,100 
17,100 
8,900 
20, 300 
10, 900 
23, 700 
12, 800 
27,000 
14, 500 . 
30,100 
16,200 
33, 200 
17, 700 
36, 100 
19, 300 
38, 800 
20, 800 
41,500 
22, 400 
Solid 
contents. 
10 
15 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
Cu. ft. 
1,050 
1,560 
2,120 
2,730 
3,350 
3,950 
4,570 
5,200 
5,840 
6,450 
7,020 
7,570 
8,100 
8,600 
9,110 
QUALITY II. 
10 
15 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
80 
3,725 
2.2 
18 
82 
2,450 
. 1,635 
3.4 
4.6 
26 
33 
108 
129 
1,100 
3,200 
300 
1,095 
5.6 
38 
145 
5,200 
1,700 
765 
6.5 
43 
156 
7,300 
3,200 
600 
7.3 
47 
165 
9,400 
4,700 
500 
8.0 
50 
172 
11, 700 
6,300 
420 
8.7 
54 
176 
14,300 
7,900 
355 
9.4 
57 
179 
17, 000 
9,500 
310 
10.0 
59 
182 
19, 700 
11,000 
270 
10.6 
62 
183 
22, 400 
12,500 
230 
11.3 
64 
185 
25,200 
13, 900 
205 
11.8 
66 
186 
27, 800 
15, 300 
180 
12.4 
69 
187 
30, 400 
16, 700 
155 
13.0 
71 
188 
32, 900 
18, 100 
1,000 
1,380 
1,840 
2,330 
2,820 
3,320 
3,830 
4,360 
4,880 
5,360 
5,830 
6,280 
6,730 
7,160 
1 Counties in North Carolina are: Alexander, Burke, Cabarrus, Catawba, Cleveland, De 
Lincoln, McDowell, Rowan, Rutherford, Surry, Wilkes, and Yadkin. 
ae, Gaston, 
