98 



oak, swamp Spanish oak, hackberry, elm, tupelo gum, and hickory require 

 longer periods. 



Soil Rkports 



(2) Studies of Yields 



Data were collected from 104 plots selected as representing average 

 fully stocked stands. The 73 even-aged upland plots were divided be- 

 tween the upland types as follows: (1) post oak. 14 plots; (3) scrub 

 oak, 23 plots; and (3) upland mixed hardwoods, 34 plots. There were 

 19 even-aged bottomland plots. The 13 all-aged virgin plots were di- 

 vided as follows : upland mixed hardwoods, 7 plots ; bottomland mixed 

 hardwoods, 6 plots. The plots ranged from one-sixteenth to one acre 

 and averaged .36 acres each. The ages ranged from 20 years to 110 years 

 for the even-aged plots, and three quarters of the even-aged plots were 

 fifty or more years old. 



All trees on the plots were calipered at a point 4J^ feet from the 

 ground (D. B. H.) and the tally was made by species. Record was made 

 of the soil type, density of crown-stocking, ground cover, and location. 

 The age of each even-aged plot was secured by ring counts. The heights 

 of trees in the dominant and other crown classes were measured and 

 registered by diameter and species. 



