LOGGING RESIDUES 

 AND PRODUCT VOLUME 



The net volume of logging residues represents 

 underutilization by one standard or another. By Forest 

 Survey's cubic-foot standards, residues include all 

 unused net volume between a 1-foot stump and a 4-inch 

 minimum top diameter inside bark (d.i.b.)- By board- 

 foot standards, net residue volume consists of unused 

 material in sawtimber trees from a 1-foot stump to 

 either the variable or the fixed top diameters. Mer- 

 chantable logs missed in skidding are included in saw- 

 timber residues. 



The net volume of logging residues from harvesting 

 a given volume of saw logs can be estimated by the use 

 of table 2. For example, residues from the reported 

 1966 harvest of 61,813 MCF of saw logs from growing 

 stock in Arizona are estimated to be: 



61,813 X 0.1220 = 7.5 MMCF. 



The largest part of residue volume results from 

 felling. Most of this is material from trees from which 

 saw logs have been cut. Skidding losses are relatively 

 minor and, as shown by the following tabulation, amount 

 to less than 20 percent of cubic-foot residue volume in 

 the Arizona-New Mexico area, as well as in each of the 

 two States. 



Fe I ling 



Product Other All 

 trees trees trees Skidding Total 



_______ -Percent ------- 



Arizona 74.20 6.78 80.98 19.02 100.00 



New Mexico 70.53 15.42 85.95 14.05 100.00 



Arizona- 

 New Mexico 72.74 10.22 82.96 17.04 100.00 



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