Table 1 . --Conversion factors to estimate total net 

 removals from inventory y Arizona and New Mexico 



Unit of measurement 

 and 



minimum top diameter 



Arizona 



New Mexico 



Arizona- 

 New Mexico 



Cubic foot 

 4 inches 



1.122 1.122 



1.122 



Board foot^ 

 Variable 



1.052 1.063 



1.056 



Board foot^ 

 7 inches 



1.051 1.061 



1.055 



international 1/4-inch log rule. 



Factors for estimating removals from sawtimber^ 

 in inventory are somewhat smaller numerically than 

 the factors used for estimating removals from growing 

 stock. Factors derived for board- foot measurements 

 to the minimum variable top standards used by Forest 

 Survey (see Sawtimber volume in Terminology) are not 

 much different from those derived for the minimum fixed 

 top of 7 inches. By both top diameter standards, 

 conversion factors used to estimate removals in Ari- 

 zona and New Mexico combined amount to 106 percent of 

 saw log volume; the proportion for either State is 

 similar. 



Correction factors are numerically less for board- 

 foot measure than for cubic-foot measure because con- 

 siderable material scaled as net cubic-foot residue is 

 not included in the net board-foot scale. Such mater- 

 ial consists of (1) the upper stem portion beyond the 

 minimum top diameter for board-foot measure, (2) the 

 volume in destroyed growing stock trees of less than 

 sawtimber size, and (3) portions of sound trees that 

 are cull (because of crook) for saw logs. 



^Board-foot volumes used in this report are 

 International 1/4-inch log rule volumes. 



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