28 BULLETIlSr 820, U. S. DEPARTMENT OF AGRICULTUEE. 



Table 16. — Cost per acre of growing jack pine, figured for $2, -$5, and $8 initial invest- 

 ment, including cost of land and cost of planting, if any, at compound interest. 



AT 6 PER CENT COMPOUND INTEREST.' 



Age. 



Cast per acre, at 6 per cent com- 

 pound interest. 



Cost per acre, at 3 per cent com- 

 pound interest. 





$2. 



.?5. 



»s. 



$2. 



$5. 



$8. 



years. 

 20 



S8.98 



12.42 



17.02 



23.17 



31.40 



42.42 



57.16 



76.89 



103.30 



138.63 



185.91 



S19. 72 



26.95 



36.63 



49.57 



66.91 



90.09 



121.13 



162. 67 



218.25 



292.64 



392. 19 



S30.44 



41.47 



56.23 



75.98 



102.41 



137.78 



185.10 



248.45 



333.22 



446. 65 



598.45 



.15. 49 

 6.74 

 8.18 

 9.86 

 11.80 

 14.05 

 16.67 

 19.69 

 23.19 

 27.26 

 31.98 



S11.72 

 14.12 

 16.90 

 20.12 

 23.85 

 28.18 

 33.20 

 39.02 

 45. 77 

 53.58 

 62.65 



.?17 94 



25 



21.49 



30 



25 60 



35 



30 37 



40 



25.90 



45 



42.30 



50 



49 73 



55 



58.35 



60 



68.33 



65 



79 90 



70 



93.32 







The followiag is allowed for annual expenses in the above calculations: Five cents per acre for admin- 

 istration and protection, plus 1 per cent of initial cost for taxes, at 6 per cent or 3 per cent compound interest. 

 This amount is added to the cost of the initial investment to date. 



MANAGEMENT. 



SUITABILITY OF JACK PINE FOR MANAGEMENT. 



Jack pine is well suited for fore.5t management for three reasons: 

 (1) It thrives on poor soils; (2) it cjuicldy reproduces itself after 

 lumbering and fire, forming pure, densely stocked stands; and (3) 

 it grows rapidly in its early years and soon attains sizes suitable for 

 pulpwood, box boards, crating, small-dimension lumber, mine tim- 

 bers, and slack-cooperage staves and heading. Its good growth on 

 poor soils, unsuited to agricultural crops or on which more valuable 

 kinds of tress do not readily seed up, suggests the possibihty of 

 utilizing large tracts of land which would otherwise be unproductive. 

 The probability of this cla.ss of lands coming more and more under 

 State or Federal control increases the importance of jack pine as a 

 tree for forest management on a large scale. 



Jack pine quickly seeds up poor soils and burned-over areas and 

 makes them productive much sooner than would otherwise be the 

 case. The more valuable Norway and white pines gradually seed 

 in under the shelter of jack pine stands when the soil conditions im- 

 prove. Wherever there is Norway or white pine reproduction 

 underneath it to take its place, the jack pine should be eliminated 

 after it reaches merchantable size. 



Where jack pine occurs in mixture with Norway pine" or other more 

 valuable species on soils weU suited to these latter, the natural 

 reduction of jack pine that takes place with the increasing age of 

 the stand should be allowed to go on. In some cases it may be 

 advisable to reduce the proportion of jack pine by one or more 

 cuttings to encourage the more valuable Norway pine in restocking 

 the area and afterward to supplement the natural reproduction with 



