932 
Journal of Agricultural Research 
Vol. XXXI, No. 10 
Table II gives the seedling height growth of noble fir grown under 
average conditions in the same locality as indicated in Table I. 
Table III gives the average number of years required for noble fir 
seedlings to attain various heights. 
AGE IN YEARS 
Fig. 2.—Height-growth curves for seedlings of noble fir, Douglas fir, and western hemlock. 
Figure 2 illustrates graphically the seedling height growth of noble 
fir, Douglas fir, and western hemlock, in western Washington and 
Oregon. 
Table II .—Seedling height growth of noble fir a 
Age 
Height 
Current 
annual 
growth 
Age 
Height 
Current 
annual 
growth 
Years 
Feet 
Feet 
Years 
Feet 
Feet 
1____ 
9.... 
3.45 
.55 
2__ 
10.... 
4.04 
.59 
3.... 
0.84 
0.28 
11.... 
4.69 
.65 
4_____ 
1.16 
.32 
12___ 
5.38 
.69 
5. .. 
1.53 
.37 
13... 
6.12 
.74 
6... 
1.94 
.4L 
14___ 
6.88 
.76 
7 ... 
2.39 
.W 
15___ 
7.62 
.74 
8.... 
2.90 
.51 
16___ 
8.32 
.70 
° Based on 282 measurements. 
The seedling height growth of noble fir is slower than that of 
either Douglas fir or western hemlock. To attain breast height, 4.5 
feet above the ground, it takes noble fir an average of 11 years, 
open-grown western hemlock 7 years, and Douglas, fir 6 years. 2 
2 MUNGER, T. T. THE GROWTH AND MANAGEMENT OF DOUGLAS FIR IN THE PACIFIC NORTHWEST. U. S. 
Dept. Agr., Forest Serv. Circ. 175, 27 p., illus. 1911. 
