66 



LOBLOLLY OR NORTH CAROLINA PINE. 



TABLE 18. DIAMETER GROWTH OF LO.BLOLLY PINE ON DIFFERENT SITES INSIDE THE BARK ON 

 STUMPS ABOUT Two FEET HIGH. 



GROWTH IN VOLUME. 



Cubic Feet. 



As both height and diameter growth of loblolly pine are most rapid in 

 early youth, the greatest per cent of volume increment is made during 

 this period. The contents in cubic feet of the stem of a tree without 

 bark or branches, at different ages, is the best index of the rate of growth 

 in total volume. The growth of the stem of the trees of loblolly pine in 

 cubic feet in different quality classes is given in Table 19. The growth 

 in cubic feet of trees in stands on different sites is given in Table 20. 



Board Feet. 



The volume in board feet increases at a more rapid rate than the 

 volume in cubic feet on account of the greater proportion of convertible 

 material in timber of large diameter than in small. The volume in 

 board feet of the dominant trees in stands at different ages is given in 

 Table 21 by Doyle-Scribner rule, and on the basis of actual mill cut 

 1-7 inch saw kerf band-sawed. The volume of trees on different sites 

 at given ages is given in Table 22. It is probable that the rapid increase 



