14 



BULLETIN 820, U. S. DKPARTMBNT OF AGRICULTURE. 



Table 10. — Yield per acre of pure, even-aged, densely stoclced stands of jack pine in Huh- 

 hard County, Minn., calculated in cubic feet, cords, andhoardfeet. 



SITE QUALITY "GOOD." 







Tield per acre. 







Ag6v 



Trees 5 



inches 



and over. 



Trees 5 inches and 

 over. 



Mill tally. « 



Scribner Decimal C.5 



. 



With 

 bark.2 



Peeled.3 



Trees 5 



inches 



and over. 



Trees 8 



inches 



and over. 



Trees 8 



inches 



and over. 



Trees 10 



inches 



and over. 



Years. 

 20 



Cu.ft.^ 

 160 

 650 

 1,360 

 2,210 

 2,800 

 3,160 

 3,420 

 3,640 

 3,840 

 4,010 

 4,180 



Cords. 

 1.6 

 6.5 

 13.6 

 22.1 

 28.0 

 31.6 

 34.2 

 36.4 

 38.4 

 40.1 

 41.8 



Cords. 

 1.3 

 5.3 

 11.2 

 18.2 

 23.1 

 26.1 

 28.3 

 30.1 

 31.8 

 33.3 

 34.7 



Board ft. 

 500 

 3,200 

 6,900 

 10,500 

 13,200 

 14,900 

 16,300 

 17,400 

 18, 500 

 19, 600 

 20,600 



Boardft. 



Boardft. 



Boardft. 



25 



700 



1,900 



3,200 



4,700 



6,500 



8,600 



10,700 



12, 500 



14,000 



15,300 



300 

 700 

 1,400 

 2,300 

 3,800 

 5,200 

 6,200 

 6,900 

 7,600 

 8,200 





30 





35 . 



300 



40 



1,309 



45 



2,200 



50 



2,900 



55 



3,400 



60 



4,000 



65 



4,400 



70 



4,800 







SITE QUALITY "POOR." 



25 



130 



470 



870 



• 1,300 



1,670 



1,990 



2,280 



2,550 



2,790 



3,010 



1.3 



4.7 

 8.7 

 13.0 

 .16.7 

 19.9 

 22.8 

 25.5 

 27.9 

 30.1 



LI 

 3.8 

 7.1 

 10.6 

 13.7 

 16.3 

 18.7 

 21.0 

 23.0 

 24.9 



700 

 2,200 

 4,000 

 6,200 

 8,100 

 9,600 

 10, 900 

 12, 200 

 13,400 

 14, 500 









30 









35 









40 



200 

 1,100 

 2,200 

 3,400 

 4,900 

 6,600 

 8,200 







45 



400 

 800 

 1,500 

 2,500 

 '3,800 

 4,900 





50 ■ 





55 



300 



60 



1,000 



65 



1 600 



70 



2 100 







1 Total volume of stem, including bark. 

 2 100 cubic feet equal 1 cord. 



3 Per cent of bark in total volume, 18.9 down to 16.9, decreasing with increase in age. 



4 Scaled by white-pine mill-cut table. See Table 27, in appendix. 



6 Stump height, 1 foot; diameter inside bark at top, 5.5 inches, scaled by Table 25 (appendix). 



Based on Dlots given in Tables 34 and 35 in the appendix. 



In these tables "good" quality of site indicates the better classes 

 of soils which would be suitable for growing Norway pine, while 

 "poor" quality indicates those soils not so well adapted to Norway 

 pine. 



Tables 34 and 35 (appendix) give the details of the field measure- 

 ments of the plots used as the basis of Tables 9 and 10. All of these 

 plots were used as a basis for determining the total cubic volume. 

 The items other than total cubic volume were based on selected plots 

 classified as qualities "good" and "poor" on the basis of their total 

 cubic yield. This classification corresponds closely to a classification 

 based on the average dominant heights of the different plots. (See 

 fig. 3, facing p. 16.) The plots selected were those whose total cubic 

 volumes were close to the average curves for total cubic volumes. 



Table 1 1 shows the growth and yield of six plots at different points 

 in northern Minnesota, the data having been collected and computed 

 by State Forester Cox. Under the heading, "Quality of site," 



