32 



BULLETIN 154, U. S. DEPAETMEXT OF AGEICTTLTTJRE. 



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 I. 







Yield. 







Annual growth. 











Board feet scaling 

 in top to — 



Cubic feet. 



Board feet sea 



Ling in top to — 



Age in 

















years. 



Cubic 



















feet. 











6 inches. 



8 inches. 







6 inches. 



8 inches. 



Mean. 



Periodic. 













Mean. 



Periodic. 



Mean. 



Periodic. 



10 



150 

 450 

 950 

 1,900 

 3,050 

 4,000 

 4,900 

 5,600 

 6,300 

 6,800 







15 

 22 

 32 

 47 

 61 

 67 

 70 

 70 

 70 

 68 



15.0 

 30.0 

 50.0 

 95.0 

 115.0 

 95.0 

 90.0 

 70.0 

 70.0 

 50.0 











20 















30 



900 

 3,200 

 5,600 

 8,100 

 10, 700 

 13, 400 

 15,800 

 18,200 





30 

 80 

 112 

 135 

 153 

 167 

 176 

 182 



90 



230 

 240 

 250 

 260 

 270 

 240 

 240 







40 







50 









60 









70 









80 









90 









100 



2,500 



25 



25( 



110 



7,200 



20,500 



5,000 



65 



40.0 



186 



230 



45 



25( 



120 



7,450 



22,700 



7,600 



62 



25.0 



189 



220 



63 



26( 



130 



7,600 



24,600 



10, 700 



58 



15.0 



190 



190 



82 



31( 



140 



7,750 



26,400 



14,000 



00 



15.0 



189 



180 



100 



33( 



150 



7,850 



28,200 



17, 300 



52 



10.0 



188' 



180 



115 



33( 



160 



7,900 



29,800 



20, 400 



49 



5.0 



186 



160 



127 



31( 



170 



7,925 



31,200 



23,300 



47 



2.5 



184 



140 



137 



29( 



180 



7,950 



32, 600 



25,800 



44 



2.5 



181 



140 



143 



25( 



190 



7,975 



33,600 



28, 000 



42 



2.5 



177 



100 



147 



22( 



200 



8,000 



34,600 



30,000 



40 



2.5 



173 



100 



150 



m 



210 



8,025 



35,600 



31,500 



39 



2.5 



170 



100 



150 



15( 



220 



8,050 



36,600 



32,800 



37 



2.5 



166 



100 



149 



13( 



AVERAGE SITES— QUALITY II. 















Annual growth. 





Patio of 



M 



je in years 





Yi< 



!ld. 









board 

 feet to 





















Mean. 



Periodic. 



Mean. 



Periodic. 



cubic feet 









Cu.ft. 



Bd.ft* 



Cu.ft. 



Cu.ft. 



Bd.ft. 



Bd.ft. 





10 







90 

 270 

 570 

 1,140 

 1,830 

 2,400 

 2,940 

 3,360 

 3,780 

 4,0S0 

 4,320 

 4,470 

 4,560 

 4,650 

 4,710 

 4,740 





9 

 13 

 19 

 28 

 37 

 40 

 42 

 42 

 42 

 41 

 39 

 37 

 35 

 33 

 31 

 30 



9 

 18 

 30 

 57 

 69 

 57 

 54 

 42 

 42 

 30 

 24 

 15 

 9 

 9 

 6 

 3 









20 .. 











30 



540 

 1,920 

 3,360 

 4,860 

 6,420 

 8,040 

 9,480 

 10, 920 

 12,300 

 13, 620 

 14, 760 

 15, 840 

 16,920 

 17,880 



18 



48 



67 



81 



92 



100 



105 



109 



112 



113 



114 



113 



113 



112 



54 

 138 

 144 

 150 

 156 

 162 

 144 

 144 

 138 

 132 

 114 

 108 

 108 



96 



6.9; 

 1.6S 

 l.ftll 



2.0: 



40 



50 



60 



70 



2.1? 



80 



2.3< 



90 



2.51 



100 



2.6* 

 2.K 

 3. Of 

 3.24 

 3.41 

 3.6( 



3.7; 



110 



120 



130 



140 



150 



160 









l 



Board fee 



t scaled to 



6 inches h 



i the top. 









