﻿22 BULLETIN 13, U. S. DEPARTMENT OE AGRICULTUEE. 



Table 4. — Yield per acre in cubic feet, quality II. 



Age. 



Aver- 

 age 

 height 

 of domi- 



Diam- 

 eter 

 breast 

 high of 



Num- 

 ber of 

 trees 

 per 

 acre. 



Basal 

 area 

 per 



Total 

 yield. 



Age. 



Aver- 

 age 

 height 

 of domi- 



Diam- 

 eter 

 breast 

 high of 



Num- 

 ber of 

 trees 

 per 



Basal 



' area 



per 



Total 

 yield. 





nant 



average 



acre. 







nant 



average 



acre. 







trees. 



tree. 









trees. 



tree. 









Yeats. 



Feet. 



Inches. 





Sq.ft. 



Cu.ft. 



Years. 



Feet. 



Indies. 





Sq.ft. 



Cu.ft. 



10 



6.0 



1.4 



2,015 



20 



650 



60 



74.5 



10.7 



397 



248 



8,500 



15 



12.0 



2.2 



1,834 



50 



1,150 



65 



79.0 



11.6 



348 



255 



9,200 



20 



19.5 



3.2 



1,626 



90 



1,750 



70 



83.0 



12.4 



311 



261 



9,840 



25 



28.0 



4.] 



1,420 



131 



2,420 



75 



86.5 



13.3 



277 



267 



10, 400 



30 



36.5 



5.1 



1,192 



169 



3,250 



80 



90.0 



14.1 



251 



272 



10, 930 



35 



44.5 



6.1 



950 



193 



4,180 



85 



93.0 



14.9 



229 



277 



11, 400 



40 ' 



51.5 



7.1 



760 



209 



5,130 



90 



95.5 



15.7 



210 



282 



11,850 



45 



58.0 



8.0 



633 



221 



6,100 



95 



98.0 



16.4 



195 



286. 



12, 250 



50 



64.0 



8.9 



537 



232 



7,000 



100 



100.0 



17.1 



182 



290' 



12,630 



55 



69.5 



9.8 



460 



241 



7,800 















Table 5. — Yield per acre in cubic feet, quality III. 





Aver- 



Diam- 



Num- 

 ber of 

 trees 

 per 









Aver- 



Diam- 



Num- 

 ber of 

 trees 

 per 







Age. 



age 

 height 

 of domi- 



eter 

 breast 

 high of 



Basal 

 area 

 per 



Total 

 yield. 



Age. 



age 

 height 

 of domi- 



eter 

 breast 

 high of 



Basal 

 area 

 per 



Total 

 yield. 





nant 



averaee 



acre. 







nant 



averaee 



acre. 







trees. 



tree. 











trees. 



tree. 









Years. 



Feet. 



Inches. 





Sq.ft. 



Cu.ft. 



Years. 



Feet. 



Inches. 





Sq. ft. 



Cu.ft. 



10 



4.0 



1.0 



2,408 



14 



530 



60 



64.0 



8.6 



543 



219 



6,530 



15 



9.0 



1.6 



2,234 



33 



900 



65 



68.0 



9.4 



465 



224 



7,160 



20 



14.5 



2.3 



2,060 



60 



1,350 



70 



71.5 



10.1 



412 



229 



7,760 



25 



21.0 



3.1 



1,886 



98 



1,850 



75 



75.0 



10.9 



361 



234 



8,320 



30 



28.5 



3.9 



1,676 



139 



2,450 



80 



78.0 



11.7 



318 



238 



8,820 



35 



36.0 



4.7 



1,400 



167 



3,100 



85 



81.0 



12.4 



288 



242 



9,300 



40 



42.5 



5.5 



1,118 



183 



3,780 



90 



83.0 



13.2 



258 



245 > 



9,750 



45 



48.5 



6.3 



900 



194 



4,500 



95 



85.5 



13.8 



239 



248 



10,150 



50 



54.0 



7.0 



764 



204 



5,200 



100 



87.0 



14.5 



219 



251 



10, 530 



55 



58.0 



7.8 



639 



212 



5,870 















Although only fully stocked stands were selected as a basis for the 

 tables, the field data were further narrowed by choosing only those 

 which came nearest to the average degree of stocking. As a means 

 of making the selection the total basal area per acre of the sample 

 plots — that is, the aggregate cross-section area at breast height of all 

 the trees, expressed in square feet — were plotted on cross-section paper 

 according to age and quality and an average curve drawn through the 

 points representing each quality class. All the sample plots in each 

 class which deviated from the average by more than 10 per cent were 

 considered abnormally stocked. Cubic-foot yields given in the tables 

 were computed by means of Table 26, Appendix. 



The lumber yields given in Table 6 are the graphical averages of 

 the individual sample plot yields obtained by means of the board-foot 

 volume table 24 on page 66, which is based on the actual saw cut. 

 All trees over 5 inches breast high were scaled. 



