152 FOREST l?EGUI,ATION 



2. Yield table. Pine, Site IF, rotation sixty years, fully stocked. 

 Thinnings not considered. 



YIEI.B I'EK 

 AGE. ACR1C 



CU1!IC FT. 

 10 460 



20 1200 



30 2250 



40 3400 



50 4503 



Ho 5''>03 



3. 'J'he Xormal Growinj^; Stock or Growing Stock on sixty 

 acres of Xormal or Regulated Forest: 



a. liy average yearly growth of ripe timber per acre. 

 I !y Diagram. Fig. 7 : r = 60 y ; Yr = 5600 : G = 5600 X 60/2. 

 (lowing Stock = 168,000 cu. ft. on 60 acres, or 2800 per acre.* 

 h. Calculated from the above Yield Table by the formula 

 n (a + b -|- c -|- d -j- e -j- f/2), growing stock on sixty acres is : 



a = 460 c = 2250 e = 4500 



b = 1 200 d = 3400 f/2 = 2800 



On 60 acres: 146TO X 10 == 146,100; or 2450 per acre. 



4. Actual Growing Stock on this Forest: 



a. Calculated by Yield Tables. 



AREA .\GJC SroCKEII 



ACRES. YEVKS. IXO.T. VOI.U M E 1 N CUBIC FEET 



70 to 0.9 70 X 0.9 X 460 = 28900 



130 20 0.7 730X0.7X^200^109200 



60 30 0.8 60X0.8X2250=108000 



200 40 0.7 20D X 0.7 X 3400 ^= 476000 



150 50 0.7 150X0.7X4500 = 472500 



40 60 0.8 40 X 0.8 X 5600 = 1 79200 



Total on 650 acres = 1,373,800 cul)ic feet. 



Per acre Ga. or Actual Growing Stock = 21 10 cubic feet. J 



* The usual calculations for conditions of this Growing Stock for fall 

 and spring are left out of consideration. 



% ."Ml figures rounded off in these problems. 



