54 BULLETIN 149 7, U. S. DEPARTMENT OF AGRICULTURE 
Table 8. — Yields of northern white pine in natural well-stocked stands 
Aver- 
age 
height 
of 
domi- 
nant 
trees 
Diam- 
eter 
breast 
high 
Yield per acre 
Age 
(years) 
Aver- 
age 
height 
of 
domi- 
nant 
trees 
Diam- 
eter 
breast 
higb. 
Yield per acre 
Age 
(years) 
MiU 
tally 
Scribner 
rule 
Mill 
tally 
Scribner 
rule 
5 
Feet 
1 
4 
15 
28 
Inches 
Board feet 
Board feet 
60 
Feet 
64 
71 
78 
83 
87 
Inches 
9 
10 
12 
13 
15 
Board feet 
33, 600 
42, 300 
50, 100 
57, 000 
62, 800 
Board feet 
12, 500 
10- 
1 
2 
4 
70 
16, 700 
20 
80 
20, 000 
30.-- 
5,300 
14, 200 
24, 100 
87666 
90 
23, 500 
40 
42 | 6 
54 
100 
28, 000 
50- 
120 
39,700 
! 
Figures in this table with the exception of those for yields by Scribner decimal C rule are from Tables 
5 and 6 in the bulletin by Frothingham (.24) already cited. Based on poor site quality New Hampshire 
white pine, they apparently correspond to good site in the Lake States. Mill-tally yields are based on 
actual saw cut. Figures in the last column are from Table 31 in the same bulletin for virgin forest in 
northern Minnesota. 
Table 9. — Yields of jack pine 
Age (years) 
Total 
height 
of 
average 
tree on 
me- 
dium 
site 
Diameter breast 
height on me- 
dium site 
Yield per acre by site quality 
Aver- 
age 
Maxi- 
mum 
Good 
Medium 
Poor 
5-. 
Feet 
3 
9 
23 
34 
44 
52 
58 
63 
67 
Inches 
Inches 
Board feet 
Cords 
Board feet 
Cords 
Board feet 
Cords 
10 
.- 
4 
5 
6 
7 
8 
9 
2 
5 
8 
9 
11 
12 
12 
13 
20 . 
500 
3,000 
9,500 
16,000 
20, 500 
24, 000 
26,000 
10 
26 
37 
43 
46 
48 
50 
5 
17 
27 
33 
36 
38 
40 
30 
1,000 
3,500 
7,500 
11, 500 
15,000 
16, 500 
500 
1,000 
2,500 
4,500 
6,500 
8,000 
8 
40 
16 
50 
22 
60 
25 
70 
27 
80 
28 
The yields in this table are taken from an unpublished study of Jack Pine Yields by A. E. Wack- 
erman. Maximum diameters are from a publication by Sterrett (63). Board-foot yields are based 
on the international log rule, allowing one-eighth inch for saw kerf. 
Under certain conditions, which are discussed later, the yields of 
timber crops grown to 80, 100, and 120 years are also of interest. 
Saw timber of Norway and northern white pine is the most promis- 
ing form of forest crop for these longer periods. Yields of 30,000 
board feet to the acre at 80 years, 40,000 board feet at 100 years, and 
50,000 board feet at 120 }^ears may be expected. 
TABULAR SUMMARY 
Most of the details of importance to an individual or company con- 
sidering forest planting have now been discussed. They are sum- 
marized and emphasized in Table 10. 
