second tract of 47,000 board feet at 70 years must be reduced 15 

 per cent, which will amount to 39,950 feet. The third tract 30 

 years from now will yield 80 per cent of 32,000 board feet or 

 25,600 feet. The following tabulation gives the results for the 

 entire area: 



60 years_. 

 70 years... 

 80 years... 



Tot-.il. 



Cutting age 



Yield 



Board feet Acres 



■ 



25,000 







Total yield 



Board feet 

 14,175,000 

 9, 9S7, 500 

 6, 400, 000 





APPLICATION OP STAND TABLES 



It 1.; md that. 1 site, fully stocked 



southern | diameter have the 



same range of diam< I atage of trees in any 



diami I e been 



prepai I age of 



. contained 



I learn from 



I any particular diai 



. Bite and at a given age, it La 



only aecessary to obtain from the yield tables for the specified 



bal number 

 of trees. Both hould be for the entire stand, ;. e., all 



EUneter breast high and over. 

 Aa an [Hi f the process, suppose that the number of 4 



determined in a fully stocked Loblolly 

 old. on a 90-foot site. Table 34 shows that 

 the diameter breast high of this stand is 7 inches, and Table 36 

 that fc] 540. Table 161 gives the per- 



centage of trees 4 inches or larger in a 7-inch stand as 90, and of 

 trees 6 inches or larg The difference, or 24 per cent, is 



the proportion of 4-inch and 5-inch trees; 24 per cent of 540 is 

 130. The number of trees in the 4-inch and 5-inch classes is 

 therefore 130. 



Tah» 53, 164, an • ing the absolute number of 



trees at and above van - ih limits on average sites at 



various ages, have been prepared by this method by interpola- 

 tion in the percentage stand tables. If the number of trees in a 

 single inch ve odd inches, is desired, interpolation 



in these tables is again nec< Because the intervals between 



11 



