JACK PINE. 

 TABLES. 



35 



Table 17. — Proportion of the occurrence of jack, Norway, and vjhite pine stands on 

 different soils in northern Minnesota classified according to the 'prevailing size of their 

 soil -particles.^ 



Class of soil. 



Jack 



pine 



stands. 



Norway 



pino 

 stands. 



Wliito 



pino 



stands. 



Fino Rravol, 2.0 to 1 mm 



Conrso sand, 1 to 0.5 ram 



Medium sand, 0.5 to 0.25 mm . 



Fine sand, 0.25 to 0.1 mm 



Vory fine sand, 0.1 to 0.05 mm 



Silt, 0.05 to 0.005 mm 



Clay, 0.005 mm 



Total 



Per cent. 

 1.1 

 61.0 

 30.3 

 3.3 

 3.7 

 1.9 

 1.7 



I'cr cent . 

 0.4 

 3.7 

 12.0 

 62.9 

 11.5 

 6.7 

 2.8 



Per cent. 

 0.0 

 3.3 

 4.6 

 16.2 

 43.4 

 26.1 

 6.4 



100.0 



100.0 



100.0 



» From unpublished preliminary report on Norway pine in Minnesota by H. H. Chapman. Based on 

 mechanical analysis by the Bureau of Soils of a large number of soil samples from different jack, Norway, 

 and white pine stands. 



Table 18. — Average width of croivhs of predominant jack-pine trees of different ages 

 and diameters, with enough light for good crown development, and groivmg in compara- 

 tively dense, even-aged stands. 



[Measurements by H. H. Chapman in Hubbard County, Minn., 1905.] 





Site quality "good." 



Site quality "poor." 



Age. 



Average 



diameter 



breast 



high. 



Width 



of 

 crown. 



Basis. 



Average 



diameter 



breast 



high. 



Width 



of 

 crown. 



Basis. 



Years. 

 10 



Inches. 

 1.8 

 5.5 

 7.9 

 9.4 

 10.8 

 12.0 



Feet. 

 7 

 11 

 14 

 16 

 18 

 22 



Trees. 



Inches. 

 1.1 

 3.9 

 5.9 

 7.4 

 8.7 

 9.9 

 10.9 

 11.8 



Feet. 



3 



6 



9 



11 



12 



14 



15 



16 



18 



19 



22 



24 



27 



Trees. 



20 



1 

 9 



38 



18 



4 





30 



5 



40 .. . 



19 



50 :.. 



3 



60 



35 



70 



13 



80 









8 



90 









5 



100 











1 



110 













120 













130 











2 

















70 



91 



