JACK PINE. 11 



Table 3. — Rate of grototh in diaTnielcr of second-growth jach pine in northern Minnesota. 





Age. 



Diameter breast liigh. 



Age. 



Diameter broa.st high. 





Maximum. 



Average. 



Maximum. 



.\verage. 



5 



Vcars. 



Inches. 



Inches. 



30.... 



Years. 



Inches. 

 7.7 

 8.6 

 9.5 

 10.3 

 11.1 



Inches. 

 5.7 



10 



1.8 

 3.6 

 5.2 



G. 5 



1.2 

 2.5 

 3.8 



4.8 



35 



6.5 



15 



40 



7.3 



20 ... 



45 



8.1 



25 



50 



8. ;» 









Note. — Based on decade measurements on 40 1-foot stumps 32 to 51 years old. Measurements by J. St. J. 

 Benedict, in Cuss County, Minn. 



Table 4. — Rate of groivth in diameter and height of dominant jack pine trees in Craw- 

 ford and Roscommon Counties, Mich. 





Average dominant 

 growth. 



Maximum growtli. 



Age. 



Average dominant 

 growth. 



Maximum growtli. 



Age. 



Diameter 



breast 

 liigli. 



Total 

 height. 



Diameter 

 breast 

 high. 



Total 

 height. 



Diameter 



breast 

 high. 



Total 

 height. 



Diameter 



breast 

 high. 



Total 

 height. 



Years. 

 5 



Inches. 



Feet. 

 2 

 8 

 15 



22 

 28 

 34 

 39 



44 

 48 

 52 



Inches. 



Feet. 

 4 



13 

 22 

 31 

 39 

 45 

 51 

 56 

 61 

 64 



Years. 



55 



60 



65 



70 



75 



80 



85 



90 



95 



100 



Inches. 

 8.4 

 8.8 

 9.2 

 9.6 

 10.0 

 10.3 

 10.7 

 11.1 

 11.5 

 11 8 



Feet. 

 55 

 58 

 61 

 63 

 64 

 65 

 66 

 67 

 67 

 68 



Inches. 

 11.0 

 11.5 

 12.0 

 12.4 

 12.8 

 13.1 

 13.5 

 13.9 

 14.3 

 14.7 



Feet. 

 67 



10 



15 



20 



25 



30 



35 



40 



45 



50 



0.8 

 2.0 

 3.1 

 4.2 

 5.2 

 6.0 

 6.7 

 7.3 

 7.9 



1.5 

 3.2 

 4.8 

 6.3 

 7.5 

 8.4 

 9.3 

 9.9 

 10.5 



70 

 72 

 74 

 75 

 76 

 77 

 78 

 79 

 80 



Diameters based on decade measurements on 122 1-foot stumps 25 to 104 years old. 

 that it would take 4 years to grow to a stump height of 1 foot. 

 Heights based on sectional age counts on 150 trees 25 to 104 years old. 

 Measurements by T. H. Sherrard, 1901. 



It was assumed 



Table 5. — Measurements^ on 13 trees in a dense young stand of jack pine on sandy pine^ 

 plain in the Upper Peninsula of Michigan. 



(The trees were cut for pulpwood in 4-toot lengths and taken to a top diameter of 4 inches, with an 

 average of 122 pieces per cord. See PI. XII.] 



.Vverage. Maximum. Minimum. 



Age years . . 



Height feet . . 



Diameter, breast hi^ inches . . 



Vohmie in board feet (possible mill cut of round-edge material) 



Clear length feet . . 



Merchantable length feet . . 



Number of 4-foot sticlis per tree 



47 



55 



40 



50.8 



57 



44 



0.9 



9 



5 



28 



60 



15 













31. G 



44 



24 



8 



11 







1 Measurements by Huber C. Hilton, 1918. 



