SHORTLEAF PINE: IMPORTANCE AND MANAGEMENT. 



43 



Table 22.— Cost of growing shortleaf-pine saw Umber in thinned and unthinned 



stands in Virginia. 



Age of 

 stand. 



Unthinned stand. 



Thinned stand. 



Accumu- 

 lated cost of 

 investment. 



Yield. 



Cost of 

 growing 

 per M. 



Net cost per 



acre of 



producing 



crop. 1 



Final yield. 



Cost of 



growing per 



M board 



feet. 



Years. 

 20 

 25 

 30 

 35 

 40 

 45 

 50 



Dolls. 

 11.04 

 16.46 

 23.72 

 33.43 

 46.43 

 63.82 

 87.10 



Bd.ft. 



Dolls. 



Dolls. 

 11.04 

 15.68 

 21.75 

 29.64 

 40.06 

 54.33 

 73.70 



Bd.ft. 



Dolls. 







900 

 8,400 

 13,400 

 16, 400 

 18, 700 

 20,400 



17.00 

 2.59 

 2.21 

 2.44 

 2.90 

 3.61 



200 

 1,400 

 6,000 

 10,200 

 13,106 





23.80 

 7.64 

 6.25 

 6.70 



1 After allowing for profit from thinnings in the form of cordwood. 



The total stumpage value of old fields at various ages and the 

 gross returns yielded on the original investment in land are given in 

 Table 23. The investment on which the gross rate of profit is based 

 includes taxes and cost of protection, assumed to be 1 per cent of the 

 land value, here placed at $5 per acre. The material from the thin- 

 nings is assumed to cover the cost of cutting without profit or loss. 



Table 23. — Interest yielded and total stumpage value per acre of thinned and 

 unthinned stands of shortleaf pine in Virginia. 



Age of 

 stand. 



Thinned stand. 



Unthinned stand. 



Yield per 

 acre. 



Value of 



stand 

 neglecting 

 thinnings. 1 



Gross rate 



per cent 



yielded on 



land value. 



Yield per 

 acre. 



Value of 

 stand. 



Gross rate 



per cent 



yielded on 



land value. 



Years. 

 30 

 35 

 40 

 45 

 50 



Bd.ft. 

 8,400 

 13,400 

 16,400 

 18,700 

 20,400 



Dollars. 

 16.80 

 26.80 

 32.80 

 37.40 

 40.80 



Per cent. 

 4.3 

 5.0 

 5.0 

 4.5 

 4.0 



Bd.ft. 



Dollars. 



Per cent. 









6,000 

 10,200 

 13, 100 



12.00 

 20.40 

 26.20 



2.5 

 3.2 



3.3 



1 Stumpage at S2 per thousand feet. 



Cordwood. — Since the yield of cordwood from stands of shortleaf 

 pine depends more upon the number than upon the size of the indi- 

 vidual trees on a given area, thinnings are not so profitable for cord- 

 wood as for saw timber. At the age of 45 years properly thinned 

 stands show an increase in cordwood of 33 per cent, including thin- 

 nings; an increase in saw timber of 80 per cent over natural unthinned 

 stands. In each case regular thinnings are made at intervals of five 

 years. Since there is little increase in the actual volume of unthinned 

 stands after the ages of about 35 to 40 years in Virginia, the rotation 

 for cordwood there is relatively short and the maximum yield is 

 reached much earlier than for the production of lumber. 



