196 



THE WOODSMAN'S HANDBOOK. 



Table 65.— Pine, Loblolly— Yield Per Acre.o 



MARYLAND. 



[Data gathered by W. D. Sterrett for Loblolly Pine Study, 1907.] 



Quality I. 



Age. 



Trees per acre. 



Aver- 

 age 

 diam- 

 eter of 

 domi- 

 nant 

 trees. 



Aver- 

 age 

 height 



of 

 domi- 

 nant 

 trees. 



Yield. 



Percentage of total 

 yield in diameter 

 classes. 



Domi- 

 nant. 



Total. 



Total. 



Box 

 boards.^ 



lto5 

 inches. 



6 to 9 

 inches. 



10 



inches 



and 



over. 



Years. 



No. 



No. 



Inches. 



Feet. 



Cu.ft. 



Bd.ft. 



Pr. ct. 



Pr.ct. 



Pr.ct. 



15 



860 



1,500 



4.9 



32 



2,100 



3,400 



65 



34 



1 



20 



550 



840 



6.5 



43 



3,000 



9,000 



32 



53 



15 



25 



400 



560 



7.8 



52 



3,650 



15,400 



13 



59 



28 



30 



310 



400 



8.9 



59 



4,200 



18,900 



4 



56 



40 



35 



250 



320 



9.8 



65 



4,500 



21,800 



1 



47 



52 



40 



200 



260 



10.6 



70 



4,750 



24,100 





34 



66 



Quality II. 



15 



1,040 



1,840 



3.6 



28 



1,550 



1,400 



78 



22 







20 



750 



1,420 



4.9 



35 



2,100 



3,800 



60 



40 







25 



550 



1,000 



G.l 



41 



2,700 



7,400 



39 



51 



10 



30 



400 



700 



7.2 



47 



3,100 



11,300 



23 



57 



20 



35 



310 



500 



8.1 



52 



3,300 



14,000 



11 



58 



31 



40 



250 



370 



8.9 



57 



3,550 



15,800 



5 



50 



45 



Note.— This table is based on sample plots of limited area. Extended areas 

 could hardly be counted on for such a uniformly dense stand unless openings were 

 carefully planted up and the forest kept under scientific control. On the other 

 hand, the natural stands contained about 10 per cent of other species, which are 

 left out of the total as a factor of safety. 



The yields were approximated by means of white-pine volume tables, and 10 per 

 cent was deducted from the yield in box boards against a possible variation between 

 the volumes of bark in the two species and as a further factor of safety. 



This table is based on 48 quality I and 23 quality II, sample plots. 



a Approximate yield in pure, unmanaged, fully stocked stands on old fields. 



b Round or "waney" edged boards— saw cut. Square-edged material would 

 show a smaller yield. 



