Growth comiDilationj 



1. Derive gross growth by reading from table 4 for the correct basal 

 area (50) and cutting cycle (35) o In this instance, gross growth 

 is 4850 board feet. Interpolate when values are intermediate to 

 those shown in the table „ 



2o Obtain a correction factor (94 percent) for age (2,6) and site 

 index (70) from table 5o This reduces growth to 4559 board feet 

 (4850 X 0,94) o 



3. Take out mortality with the 15 percent average found in the 

 study. 4559 - (.15 X 4559) or 4559 X 0.85 = 3875 board feet. 

 This is net growth of the residual trees « In case the user of the 

 table has at hand a more exact mortality correction factor for 

 his particular stand, it should be used instead of the 15 percent 

 average. 



4. Sum the reserve stand volume and net growth to obtain net volume 

 of the residual trees at the end of the cutting cycle or 5000 * 

 3875 = 8875 board feet ner acre. Periodic annual grovrth is 

 3875/35 = 111 board feet, 



5. Set UD a stand table for determination of ingrowth, using field 

 survey data as shown belows 



D.B^H, class Trees oer acre 



in inches ^onderosa pine Douglas-fir 



(Number) (Number) 



3 

 4 



5 ol9 2.75 



6 — 2,17 



7 .37 1.90 



8 — 1.28 



9 .92 .83 

 Total 1.48 8o93 



-3" 



