Timber inventory, by diameter class, 

 1952 and 1970 



RECENT TREXDS IX FOREST LAND AXD TIMBER RESOURCES 33 



Disposal of plant residues, 1952-1970 



L^ pulp \Z3 fuel CD other ZZ2 unused 



Wood residues at primary plants, 1970 



north 



DUth 



L__ 



f ] coarse 

 EZ tine 

 I i ioltwoods 

 I i hardwoods 



10 60 80 100 



BILLION CUBIC FEET 



rocky mountain 



Figure 14 



residues, and a substantia] part of the fine residues, 

 will be utilized for pulp and particleboard. 



Secondary Plant Residues 



In addition to unused residues at sawmills 

 and other primary wood processing plants, 



pacific coast 



United States 





- 



400 600 



MILLION CUBIC FEET 



Figure 16 



Table 24. — Residues at primary wood processing plants in the United States, by species group and use, 



1970 

 [Million cubic feet] 



Item 



All species 



Softwoods 



Hardwoods 





Volume 



Percent 



Volume 



Percent 



Volume 



Percent 



Used for pulp . . . _ 



1,773 

 726 

 313 



46. 6 



19. 1 



8.2 



1,514 

 599 

 241 



49.9 



19. 7 



7.9 



259 



127 



72 



33. 7 



Used for fuel ... 



16. 5 



Used for other products. . .... 



9. 4 







All uses ...... 



2,813 



73. 9 



2,354 



77.5 



459 



59. 6 







Unused: 



Coarse. .. .. . 



402 

 591 



10. 6 

 15.5 



270 

 412 



8.9 

 13.6 



132 

 179 



17. 2 



Fine . . 



23. 2 







Total unused .. . . 



993 



26. 1 



682 



22. 5 



311 



40. 4 







Total residues— .. 



3,806 



100.0 



3,036 



100.0 



770 



100. 







Source: Forest Survey surveys of wood processing plants. 



