138 



LOBLOLLY OR KORTH CAROLII^A PINE. 



Table 70. — Value of Fully Stocked Stands of Loblollt Pine, as Scaled bt Doyle-Scribn'er 

 Rule, at Different Ages on Different Quality Sites and Under Different Costs of 

 Operation; and the Per Cent of Interest on an Initial Investment of So an Acre 

 Represented by This Value. 



Quality I 



Quality II 



Quality III 



with different costs of operation. The less favorable the quality site, the 

 later is the age at which the maximum interest rate is attained. Like- 

 wise, as the cost of operating increases and stumpage value decreases, the 

 period at Avhich the stand attains its maximum interest rate is post- 

 poned and the rate of interest yielded is lower. 



On Quality I site with operating costs of $11 per 1,000 feet, the maxi- 

 mum rate, 9 per cent, is obtained on the soil value of $5 an acre when 

 the stand is 30 years old; with costs of $13 per 1,000 feet, a maximum 

 rate of 8 per cent is obtained when the stand is 40 years old ; with costs 

 of $15 per 1,000 feet, the maximum rate is 6 per cent and is attained 

 when the stand is 50 years old. 



On Quality II site the maximum interest rate on the soil value of $5 



