THE RED SPRUCE. 
43 
Table 17. — Yield of red spruce in old-field stands. 
[Based on the yield of dominant, codominant, and intermediate trees only.] 
QUALITY I. 
Age. 
1 
Trees 1 Basal 
per acre. area. 
1 
Average 
diameter 
breast 
high. 
! 
Height. Yield per acre. 1 
Forest 
form 
factor. 
Basis. 2 
Years. 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
80 
85 
90 
95 
100 
Number. 
1,294 
1,076 
887 
756 
668 
603 
558 
527 
506 
490 
478 
467 
457 
447 
437 
427 
417 
Sq.ft. 
102 
140 
169 
190 
205 
216 
225 
232 
238 
242 
247 
250 
253 
256 
259 
262 
264 
Inches. 
3.8 
4.9 
5.9 
6.8 
7.5 
8.1 
8.6 
9.0 
9.3 
9.5 
9.7 
9.9 
10.1 
10.2 
10.4 
10.6 
10.8 
Feet. 
24 
31 
36 
42 
46 
51 
55 
58 
61 
64 
66 
68 
70 
72 
73 
74 
76 
Bd.jt* Cu.fH Cords J 
Phis. 
I::::::::::::::::::::::::::::: 
1 
1 
15, 200 
19, 700 
23, 300 
26,200 
28,500 
30,500 
32,100 
33,500 
34, 800 
35,900 
37, 000 
38, 100 
39,100 
3,6G0 
4,500 
5,140 
5, 600 
5,950 
6,240 
6,490 
6,700 
6,890 
7,050 
7,180 
7,390 
7,390 
31 
40 
48 
55 
60 
64 
68 
70 
72 
74 
76 
77 
78 
.38 
.42 
.42 
.42 
.41 
.40 
.40 
.39 
.39 
.39 
.38 
.38 
.37 
1 
2 
1 
4 
5 
1 
15 
QUALITY II. 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
80 
85 
90 
95 
100 
1,6C3 
84 
3.1 
1,316 
115 
4.0 
1,002 
139 
4.9 
890 
157 
5.7 
774 
171 
6.3 
697 
181 
6.9 
643 
189 
7.4 
605 
196 
7.7 
575 
201 
8.0 
551 
206 
8.2 
532 
210 
8.5 
516 
213 
8.7 
5C3 
216 
8.9 
492 
220 
9.0 
482 
223 
9.2 
472 
226 
9.4 
463 
228 
10, 700 
14, 100 
17, 100 
19, 600 
21, 700 
23,500 
25,000 
26, 200 
27,300 
28,300 
29, 300 
30, 200 
31, 100 
3,00U 
3,770 
4,320 
4,720 
5,050 
5,310 
5,550 
5.750 
5,910 
6,050 
6,170 
6,280 
6,370 
QUALITY III. 
20 
25 
30 
35 
40 
45 
50 
55 
60 
65 
70 
75 
80 
85 
90 
95 
100 
2,134 
1, 020 
1,304 
1,074 
924 
827 
755 
703 
664 
634 
609 
588 
5G9 
551 
533 
516 
499 
67 
90 
109 
124 
136 
145 
153 
159 
164 
168 
172 
176 
180 
183 
186 
189 
192 
2.4 
3.2 
3.9 
4.6 
5.2 
5.7 
6.1 
6.4 
6.7 
7.0 
7.2 
7.4 
7.6 
7.8 
8.0 
8.2 
8.4 
14 
20 
25 
30 
34 
37 
40 
42 
45 
47 
49 
50 
52 
53 
55 
56 
57 
! 
i 


6,200 
8,000 
10, 900 
13,000 
14. 900 
16, 500 
17,800 
18, 900 
19,800 
20,000 
21,300 
21, 900 
22, 500 
2,330 
3,000 
3,500 
3,860 
4.150 
4,390 
4,590 
4,700 
4,920 
5,050 
5,170 
5,260 
5,340 
15 
22 
28 
32 
36 
39 
41 
43 
45 
47 
48 
49 
50 
.51 
.56 
.57 
.57 
.57 
.56 
.55 
.54 
.53 
.52 
.51 
.50 
.49 
2 
4 
2 
5 
1 
1 
1 1 
10 
i Yield from suppressed and dead trees ignored. See Table 53 for actual figures on which this yield 
table is based. 
2 Based on 59 plots, in even-aged old pasture stands; area 13.1 acres, taken in Oxford and Penobscot 
Counties, Me.; Coos, Grafton, and Sullivan Counties, N. H.; Caledonia and Windsor Counties, Vt. 
3 Trees 7 inches and over in diameter breast high; scaled by the New Hampshire Rule; top diameter 
inside bark, 6 inches, stump height, 1 foot. 
4 Trees 4 inches and over in diameter breast high; top diameter outside bark, 4 inches, stump height, 1 
foot. 
5 Trees 6 inches and over in diameter breast high; top diameter outside bark, 5 inches, stump height, 1 
foot. 
