44 



BULLETIN" 308, U. S. DEPARTMENT OF AGRICULTURE. 



Tables 24, 25, and 26 show the total yield in cordwood, yearly 

 increment, cost of growing, and the stumpage value per acre, and 

 gross rate of money return on the investment for various ages from 

 thinned and unthinned stands. 



Table 24. — Cordwood yield per acre of unthinned and thinned pure stands of 

 shortleaf pine in Virginia. 



[Trees 3 inches and over in diameter breast high.] 



Age. 

 (1) 



Unthinned stands. 



Thinned stands— Vi el rl nf thinnings. 



Volume 

 at dif- 

 ferent 

 ages. 



(2) 



Average 

 incre- 

 ment. 



(3) 



Volume 



of stand 



before 



each 



th inning. 



(4) 



Number 



trees 



which 



can be 



removed 



in each 



thinning. 



(5) 



Approxi- 

 mate 

 average 



diameter 

 of trees 



removed. 



(6) 



Volume 



of trees 



removed 



in each 



thinning 

 (7) 



Total 

 of all 

 previous 

 thin- 

 nings. 



(8) 



Total 

 thin- 

 nings 



Average 

 annual 



incre- 

 ment; in- 

 cluding 

 thin- 

 nings. 



(10) 



and 

 stand. 1 



(9) 



Years. 

 20 

 25 

 30 

 35 

 40 

 45 

 50 

 55 



Cords. 2 

 47 

 57 

 62 

 64 

 65 

 64 

 63 

 61 



Cords. 2 

 2.3 

 2.2 

 2.1 

 1.9 

 1.7 

 1.3 

 1.2 

 1.1 



Cords. 

 47.0 

 52.0 

 57.0 

 60.0 

 60.0 

 59.0 

 57.0 

 54.5 



930 

 205 

 150 

 110 

 85 

 68 

 55 

 45 



Inches. 

 3.3 

 4.5 

 5.0 

 5.5 

 6.0 

 6.5 

 7.0 

 7.6 



Cords. 

 6.1 

 5.1 

 5.0 

 4.8 

 4.3 

 4.0 

 3.6 



Cords. 



Cords. 

 47.0 

 58.1 

 68.2 

 76.2 

 81.0 

 84.3 

 86.3 

 87.4 



Cords. 

 2.3 

 2.3 

 2.3 

 2.2 

 2.0 

 1.8 

 1.7 

 1.6 



6.1 

 11.2 

 16.2 

 21.0 

 25.3 

 29.3 

 32.9 





1 Column 9 is the sum of colums 4 and 8. 



2 A cord refers to the standard cord of 128 stieked cubic feet, reducible to the long cord by dividing by 

 1.25. Wood has the bark on and all trees are taken 3 inches and over in diameter. 



Table 25. — Cost per cord of growing shortleaf-pine cordwood in unthinned and 

 thinned stands, thinnings included. 



Age. 

 (1) 









Thinned stands. 





Thinnings. 



Net cost 

 per acre 

 of pro- 

 ducing 

 crops. 4 



(8) 



Final 

 yield. 



(9) 



Cost of 

 growing 

 per cord.6 



(10) 



Total 

 accu- 

 mulated 

 cost. 1 



(2) 



Final 

 yield. 



(3) 



Cost of 

 growing 

 per cord. 2 



(4) 



Amount. 

 (5) 



Assumed 



value 

 per cord. 



(6) 



Accu- 

 mulated 

 value. 3 



(7) 



Years. 

 20.... 

 25.... 

 30.... 

 35.... 

 40.... 

 45.... 

 50.... 



Dollars. 

 11.04 

 16.46 

 23.72 

 33.43 

 46.43 

 63.82 

 87.10 



Cords. 

 47 

 57 

 62 

 64 

 65 

 64 

 63 



Dollars. 

 0.23 

 .28 

 .38 

 .52 

 .81 

 .99 

 1.38 



Cords. 

 6.1 

 5.1 

 5.0 

 4.8 

 4.3 

 4.0 



Dollars. 

 0.10 

 .15 

 .20 

 .25 

 .25 

 .25 



Dollars. 



Dollars. 

 11.04 

 15.68 

 21.75 

 29.64 

 40.06 

 54.33 

 73.70 



Cords. 

 47 

 52 

 57 

 60 

 60 

 59 

 57 



Dollars. 

 0.23 

 .30 

 .38 

 .49 

 .66 

 .92 

 1.30 



0.78 

 1.97 

 3.79 

 6.37 

 9.50 

 13.40 







1 Obtained by calculating the interest at 5 per cent, plus 1 per cent for taxes, making a total of 6 per cent, 

 compounded annually on a land value of So per acre. Since the land will remain after the timber is sold, 

 its value is not included in the cost of growing. 



2 Obtained by dividing column 2 by column 3. 



3 The product of columns 5 and 6 compounded at 5 per cent every 5-year period. The value of wood 

 removed in thinnings (column 6) is only nominal on account of its small size and the difficulty of making 

 thinnings. 



* The remainder after deducting column 7 from column 2. 

 s Obtained by dividing column 8 by column 9. 



