1142 
Journal of Agricultural Research 
Vol. XXVIII, No. 11 
Table II .—Increment per acre of trees 4 inches diameter breast high and over 
Plot 
No. 
Aspect 
Species 
1 
South... 
Western yellow pine.. 
2 
North... 
_do ... 
3 
Basin. _. 
_do__ 
4 
South... 
Average, plots 1 to 3, 
cut over. 
Western yellow pine. 
5 
...do_ 
Douglas fir.. 
Total.. 
Western yellow pine.. 
6 
...do_ 
Douglas fir.. 
Total....... 
Western yellow pine- _ _ 
7 
...do_ 
Douglas fir_‘. 
Total.. 
Western yellow pine. __ __ 
8 
Basin... 
Douglas fir_*. 
Total. 
Average, plots 4 to 7, vir¬ 
gin stands, south as¬ 
pect. 
Western yellow pine.. 
9 
...do. 
Douglas fir___ 
Total... 
Western yellow pine_ 
10 
...do. 
Douglas fir.. 
Total.. 
Western yellow pine__ 
11 
...do. 
Douglas fir.. 
Total__ 
Western yellow pine_ 
12 
North... 
Douglas fir.‘... 
Total.. 
Average, plots 8 to 11, 
virgin stands, basin. 
Western yellow pine.. 
13 
l 
i 
i 
« 
o 
i 
1 
1 
Douglas fir___ 
Total. 
Western yellow pine_ 
14 
...do. 
Douglas fir__ 
Total.. 
Western yellow pine_ 
15 
i 
i 
i 
t 
1 
O 
'O 
t 
1 
I 
Douglas fir. 
Total... 
Western yellow pine. 
16 
...do. 
Douglas fir. 
Total.. 
Average, plots 12 to 15, 
virgin stands, north 
aspect. 
Western yellow pine_ 
1 
Average, plots 4 to 16, virgin 
stands: c 
Western yellow pine_ 
Douglas fir_ 
Total__ 
Volume per acre 
at first measure¬ 
ment« 
Periodic annual incre¬ 
ment per acre b 
Percentage 
of periodic 
annual cu¬ 
bic foot in¬ 
crement 
Gross 
Net 
Gross 
Net 
Cu.ft. 
942.0 
Board ft, 
4,780 
Cu.ft. 
46.8 
Cu.ft. 
45.3 
Bd. ft. 
285 
5.0 
4.8 
235.9 
1,228 
15.0 
12.8 
75 
6.4 
5.4 
424.6 
2,352 
26.6 
26.6 
164 
6.3 
6.3 
534.2 
2,787 
29.5 
28.2 
175 
5.5 
5.3 
4,483.1 
28,584 
32.1 
7.5 
54 
.7 
.2 
839.6 
4,410 
10.7 
10.7 
63 
1.3 
1.3 
5,322. 7 
32,994 
42.8 
18.2 
117 
.8 
.3 
4,306. 8 
27, 212 
46.2 
24.1 
161 
1.1 
.6 
437.0 
1,902 
5.7 
5.7 
31 
1.3 
1.3 
4,743. 8 
29,114 
51.9 
29.8 
192 
1.1 
.6 
3,316.1 
21,752 
27.0 
8.0 
37 
.8 
.2 
187.5 
782 
3.8 
1.6 
9 
2.0 
.9 
3,503. 6 
22,534 
30.8 
9.6 
46 
.9 
.3 
2,499. 3 
14,992 
38.2 
-1.4 
0 
1.5 
- .1 
212.8 
1,010 
2.5 
2.5 
12 
1.2 
1.2 
2,712.1 
16,002 
40.7 
1.1 
12 
1.5 
.04 
4,070. 6 
25,161 
41.6 
14.7 
92 
1.0 
.4 
3,978. 6 
25,454 
25.2 
10.9 
82 
.6 
.3 
1, 285. 6 
5,626 
18.8 
- 6 . 1 
-25 
1.5 
- .5 
5,264. 2 
31,080 
44.0 
4.8 
57 
.8 
. 1 
2,805. 5 
18,032 
17.9 
-1.8 
-25 
.6 
- .1 
1,838.1 
8,040 
26.7 
20.0 
96 
1.5 
1.1 
4,643. 6 
26,072 
44.6 
18.2 
71 
1.0 
.4 
3,400. 7 
21, 830 
7,008 
19.3 
6.4 
68 
.6 
.2 
1,757. 0 
34.4 
34.4 
164 
2.0 
2.0 
5,157. 7 
28,838 
53.7 
40.8 
232 
1.0 
.8 
2,741.4 
18, 044 
9.0 
-50.7 
-308 
.3 
-1.8 
3,880.1 
17,034 
43.2 
41.2 
180 
1.1 
1.1 
6,621. 5 
35, 078 
52.2 
-9.5 
-128 
.8 
- .1 
5,421. 8 
30,267 
48.6 
13.6 
58 
.9 
.3 
2,537. 4 
18,640 
15.5 
-66.2 
-476 
.6 
-2.6 
2,395. 0 
9,540 
17.9 
-19.2 
-70 
.7 
- .8 
4,932.4 
26,180 
33.4 
-85.4 
-546 
.7 
-1.7 
1,909.4 
12, 298 
12.3 
-1.8 
-6 
.6 
- .1 
4,033. 3 
15, 580 
74.9 
67.6 
270 
1.9 
1.7 
5,942. 7 
27, 858 
87.2 
65.8 
264 
1.5 
1.1 
2,877. 4 
19,754 
43.7 
29.7 
170 
1.5 
1.0 
1,114. 6 
4,070 
23.0 
13.5 
52 
2.1 
1.2 
3,992.0 
23,824 
66.7 
43.2 
222 
1.7 
1.1 
1,017.3 
6, 578 
14.4 
14.4 
102 
1.4 
1.4 
2,684. 2 
10,350 
52.0 
39.3 
156 
1.9 
1.5 
3, 701. 5 
16,928 
66.4 
53.7 
258 
1.8 
1.5 
4, 642. 2 
23,698 
63.4 
19.3 
50 
1.4 
.4 
2, 556. 2 
15,984 
68.3 
52.0 
355 
2.7 
2.0 
2, 881.1 
18,439 
35.9 
11.7 
80 
1.2 
.4 
1,291.6 
5,333 
19.6 
13.2 
59 
1.5 
1.0 
4,172. 7 
23,772 
55.5 
24.9 
139 
1.3 
.6 
a Cubic volume includes the solid contents of the entire stem, including the stump, of all trees 4 inches 
and over at breast‘height. Board foot volume includes all trees 12 inches and over at breast height, vol¬ 
umes read from a Scribner decimal C volume table for the Payette Forest. 
6 Plots Nos. 1 to 7, inclusive, Nos. 10, and 13 to 16, inclusive, show increment for a 5-year period, while 
plots Nos. 8, 9, 11, and 12 show it for a 4-year period. 
c Averages are weighted by plot areas for total area of 80 acres. 
