SHORTLEAF PINE: IMPORTANCE AND MANAGEMENT, 43 
TABLE 22.—Cost of growing shortleaf-pine saw timber in thinned and unthinned 
stands in Virginia. 
Unthinned stand. Thinned stand. 
Bee! Net cost Cost of 
stand. | Accumu- Cost of CUCesUp ek OSE O 
latedcost off Yield. | growing | .Oducing |Finalyield./°y poe a 
; investment. per M. crop.1 ean 
Years. Dollis. Bd. ft. Dolls. Dolls. Bd. ft. Dolls. 
20 TL Ofer | Sacer ciseaisicraia lochs ct sias<isieiae SUES (DATs Fas SVS ee i [hen pee ee oy 
25 NGRAG alee eeis ens cos leeccsceleees 15. 68 900 17.00 
30 23.72 PAY UNE been sae eyes 21.75 8, 400 2.59 
35 33. 43 1,400 23.80 29. 64 13, 400 PISPAL 
40 ~ 46.43 6, 000 7.64 40. 06 16, 400 2.44 
45 63. 82 10, 200 6.25 54.33 18, 700 2.90 
50 87.10 13,106 6. 70 73.70 20, 400 3.61 
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 shorileaf pine in Virginia. 
Thinned stand. Unthinned stand. 
zee Value of | Gross rate Gross rate 
* | Yield per stand percent | Yieldper | Valueof | percent 
acre. neglecting | yielded on acre. stand. yielded on 
thinnings.! | land value. land value. 
SS eg ee ey 
Years.| Bd.ft. Dollars. Per cent. Bd.fi. Dollars. Per cent. 
30 8, 400 16. 80 A158: ol lnopocuqaaodal badocacoo0gd bacsoosnsoHue 
35 13, 400 26. 80 Sh) “Woooscdsasaad jagaobacouadd Bouccoacasce 
40 16, 400 82. 80 5.0 6, 000 12. 00 2.5 
45 18,700 37.40 4.5 10, 200 20. 40 3.2 
50 20, 400 40. 80 4.0 13, 100 26.20 3.3 
1 Stumpage at $2 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 jield is 
reached much earlier than for the production of lumber. 
