INCREASING THE YIELD. 



43 



Table 15 shows the most profitable diameters and ages at which to cut 

 stands of second growth yellow poplar which have been established with- 

 out cost and which are unthinned, cutting to different diameters. When 

 the current rate per cent, of increase in value falls below 6 per cent, the 

 stand can be considered as mature. It should be noted that price increment 

 is neglected. 



TABLE 15. Yellow Poplar. Period of maturity of natural unthinned 

 sccond-groivth stands for saiv-timber. Average conditions of grozvth. 

 Price increment neglected. 



Age 



of 



stand 



Years 

 20 

 25 

 30 

 35 

 40 

 45 

 50 

 55 

 60 

 65 



