This study suggests that substantial board-foot growth after the 

 first cut may be realized by: 



1. Reserving from 4,000 to 8,000 board feet per acre of good- or 

 fair-vigor, 120- to 220-year-old sav/timber. Trees should be of moderate 

 size and be provided with ample growing space c A reserve within this 

 range should result in both high board-foot increment and reasonable 

 growth percentage increase. 



2. Releasing and protecting young trees just under merchantable 

 size from damage in order to realize maximum ingrowth. 



3. Minimizing future mortality to insure highest possible net 

 growth. Bark beetles may increase to destructive numbers in large 

 tops and cull material, so closer utilization or burning or scorching 

 this material during slash disposal should be employed. Removing 

 trees susceptible to windthrow will also decrease mortality losses. 



4. Retaining ponderosa pine in preference to Douglas-fir wher- 

 ever possible because of greater grov/th per tree for a given size. 



-e- 



