* 
32 BULLETIN 154, U. S. DEPARTMENT OF AGRICULTURE. 
multiplying the yields for quality I sites by 60 per cent, which seemed 
a fair reducing factor. In the case of board-foot yields strictly accu- 
rate results are not obtained when the same reducing factor is used 
for all ages and stands. The method is, however, sufficiently accurate 
to result in figures which indicate in a general way what results may 
be expected. 
TABLE 9.—Average yield per acre of normal stands of lodgepole pine at different 
ages, Deerlodge National Forest, Mont. 
BEST SITES—QUALITY IT. 
Yield. Annual growth. 
Board cone Cubic feet. Board feet scaling in top to— 
Age in 
Years. Cubic | 
feet. 6 inches. 8 inches. 
6 inches. | 8 inches. | Mean. | Periodic. 
Mean. | Periodic.} Mean. | Periodic. 
| 
TOR et foe D5 On soe | ae Re 15 TS NOT Soe ec oie SN eee Re es | eee 
7 a ABO ee Tes ee oak ee 22 30:0 [i cae |S eae ie SO ieee Pees | eee 
BOBS See 950 | GO0K Sena st ss 32 50. 0 30 OO se. 2 ee 
ro a ae 1,900 S000 1h: See eae 47 95.0 80 230 onc cael ee 
50 Re ee 3, 050 Gai Beoeee eee 61 115.0 112 DAO) Sie Ps he a 
G(s 2 ee | 4,000 SOON Roe ae oe 67 95.0 135 2501 ose se eee 
OE ena 4,900 LO 00) Sac secs 70 90. 0 153 2607| SS Ra eae 
SOS. ese 2 5, 600 1S 400) Se eee ee oe 70 70.0 167 PH { OMA perme ie elite |p on Senet 89 
TY eee 6, 300 AY S00 Wee een e sees 70 70.0 176 240 ie a | SO 
1000S ss. 6, 800 18, 200 2,500 68 50.0 182 240 25 250 
(ES eee 7,200 20, 500 5, 000 65 40.0 186 230 45 250 
1D. | een 7, 450 22, 700 7,600 62 25.0 189 220 63 260 
1631) eee 7,600 24, 600 10, 700 58 15.0 190 190 82 310 
WAG he 7, 750 26, 400 14, 000 55 15.0 189 180 100 330 
UG ee ee 7, 850 28, 200 17,300 52 10.0 188 180 115 330 
UES ees 7,900 29, 800 20, 400 49 5.0 186 160 127 310 
POSsae2 | 7,925 31, 200 23,300 47 Dro 184 140 137 290 
SOP eee | 7,950 32,600 25, 800 44 2.5 181 140 143 250 
19Q eter ee 7,975 33, 600 28, 000 42 2.5 177 100 147 220 
DOE earn S| 8, 000 34, 600 30, 000 40 225 173 100 150 200 
7A Fs ae 8,025 35, 600 31,500 39 2.5 170 100 150 150 
77) ee 8, 050 36, 600 32, 800 37 2.5 166 100 149 130 
} 1 
AVERAGE SITES—QUALITY TI. 
Annual growth. Ratio of 
. F board 
Age in years. Yield. feet to 
Mean. | Periodic.| Mean. | Periodic. | cubic feet. 
Cu. ft Bd. ft. Cu. ft. Cu. ft. Bd. ft. Bd. ft 
TAG) a SAGO TAs ln ete nee ns 90) |e ocageet ee 9 | ies PAT eT ee rey oe | eg ee ene 
Dieigen Sree) ENE Tye. EM ad Sey. DO see eee ee 13 TBs | Sess NS le. ooo EL oe 
Oemae NAB eS I Noe on 570 | 540 19 30 18 54 0.95 
AQ = BPP ee Me 0s Oe hoes 1,140 1,920 28 57 48 138 1.68 
BN Us Sie St eS sear e aa 1,383 3,360 37 69 67 144 1. 84 
GO ee nt es ae eee oe 2, 400 4, 860 40 57 81 150 2.02 
OB Saas ss ei oS ea ea 2,940 6, 420 42 54 92 156 2.18 
Se ABE Bh ele se Be A ro Rp ST 3,360 8, 040 42 42 100 162 2.39 
Oise Se te re nae” he alias 3, 780 9, 480 42 42 105 144 2.51 
1G 0, ee Anes A ak Pt eee ne ve eR 4,080 | 10,920 41 30 109 144 2.68 
AT Opes cea 2 aie ee ee os 4,320 | 12,300 39 24 112 138 2. 85 
IQ AES Bie iaese. aie cman 4,470 | 13,620 37 15 113 132 3.05 
AS es a een, ee 4,560 | 14,760 35 9 114 114 3.24 
TAQ 2 Re eenes A Eiaay oon ela Se hae Ee 4,650 |} 15,840 33 9 113 108 3. 41 
BO Sees ee Serres ore te Al trp aie 4,710} 16,920 31 6 113 108 3.60 
INURE aU 2 Loe oe Ne aE ae ee 4,740 17, 880 30 3 112 96 Beir 
1 Board feet scaled to 6 inches in the top. 
& 
i me, 
4 
; 
