24 
BULLETIN 139, U. S. DEPARTMENT OF AGRICULTURE. 
It is an interesting fact that a Norway pine tree which has been 
stunted for from 30 to 50 years, if it recovers, adds that period to its 
normal life. This behavior has also been noticed in the case of tama- 
rack and the giant sequoias of California. Table 15 gives some 
interesting figures of increment for 8 sample plots measured in pole 
stands. The volumes are computed to a 2-inch merchantable diam- 
eter on the basis of the average tree for each diameter class. 
Table 15. * — Yield per acre of fully stocked sapling and pole stands on good-quality soil. 
Serial No. of plot. 
1 
2 
3 
4 
5 
6 
7 
8 
Location. 
Re- 
lease. 
Grand 
Rapids. 
Men- 
ahga. 
Black- 
berry. 
Clo- 
quet. 
Itasca 
Park. 
Shev- 
lin. 
Itasca 
Park. 
Soil. 
Sand. 
Sandy 
loam. 
Sandy 
clay. 
Sandy 
clay. 
Sandy 
clay. 
Sandy 
clay. 
Sandy 
clay. 
Sandy 
clay. 
Age of stand years. 
Average diameter breast-high, inches. 
Average total height feet . 
Total number of trees per acre 
Volume at present cubic feet. 
Volume 5 years ago do. . . 
Total increment last 5 years 
Annual increment last 5 years 
Average annual increment.. cubic ft. 
Volume at present cords. 
Volume 5 years ago do. . . 
Total increment last 5 years 
Annual increment last 5 years 
Average annual increment cords. 
Volume at present board feet. 
Volume 5 years ago do. . . 
Total increment last 5 years 
Annual increment last 5 years 
Average annual increment., board ft. 
13 
2 
10£ 
1,720 
145 
11 
15 
3* 
22J 
2,616 
1,235 
121 
1,114 
223 
82 
15 
3| 
16* 
713 
272 
55 
217 
44 
18 
17 
4 
20 
778 
548 
74 
474 
95 
32 
27 
5 
29 
1,512 
1,368 
647 
721 
140 
50 
27 
5 
21 
874 
1,085 
548 
537 
107 
40 
41 
4* 
40 
616 
990 
455 
535 
107 
24 
•79 
8* 
69 
524 
5,534 
4,620 
919 
184 
73 
17.3 
1.6 
15.5 
0.15 
1.3 
3.8 
0.8 
3 
0.25 
7.7 
1.2 
6.5 
1.3 
I 
19.1 
9.1 
10 
2 
0.7 
15.2 
7.6 
7.6 
1.5 
0.56 
14 
6.3 
7.7 
1.5 
0.34 
79.5 
64.6 
14.9 
3 
1 
8,645 
849 
l',560 
643 
1,912 
383 
1,519 
302 
126 
3,840 
525 
3,318 
665 
224 
9,581 
4,530 
5,047 
7,595 
3,838 
3,757 
751 
281 
6,934 
3,187 
3,745 
749 
39, 735 
32,332 
7,403 
1,580 
503 
The figures in the table would indicate a remarkably rapid growth. 
On the whole, however, it is clear that upon poor soils, and with the 
comparatively cool and short growing season, rapid growth and heavy 
yields can not be expected at an early age. The returns from either 
plantations or natural stands inside of 40 years will be negligible, yet 
in the end the species not only exceeds in the capacity for timber 
production any other species adapted to sandy soils in the North, 
but equals and probably exceeds in yield per acre the Scotch pine 
grown on similar soils in Europe. If such growth is possible in the 
more northern latitudes, and on the sandier soils, it should produce 
yields equal to or exceeding those of white pine at the southern 
1 Furnished by William T. Cox, State forester of Minnesota. 
