196 



THE WOODSMAN'S HANDBOOK. 



TABLE 65, Pine, Loblolly Yield Per Acre.a 



MARYLAND. 



[Data gathered by W. D. Sterrett for Loblolly Pine Study, 1907.] 

 QUALITY I. 



QUALITY II. 



NOTE. This table is based on sample plots of limited area. Extended areas 

 could hardly be counted on for such a uniformly dense stand unless openings were 

 carefully planted up and the forest kept under scientific control. On the other 

 hand, the natural stands contained about 10 per cent of other species, which are 

 left out of the total as a factor of safety. 



The yields were approximated by means of white-pine volume tables, and 10 per 

 cent was deducted from the yield in box boards against a possible variation between 

 the volumes of bark in the two species and as a further factor of safety. 



This table is based on 48 quality I and 23 quality II, sample plots. 



a Approximate yield in pure, unmanaged, fully stocked stands on old fields. 



& Round or "waney" edged boards saw cut. Square-edged material would 

 show a smaller yield. 



