118 



northern part of the state the upland stands are usually even-aged and 

 from sixty to eighty years old. 



The original forests probably averaged 8,000 B. F. per acre. The 

 present forests for the entire state average approximately 1,435 B. F. 

 to the acre. The better stands of upland even-aged immature timber 

 of the northern part of the state run from 3,000 to 6,000 B. F. per 

 acre. Trees below 16 inches are numerous; above that size, very few. 



The all-aged upland forests of the southern part of the state have 

 been overcut and not enough trees remain to insure maximum yields. 

 The bottomland stands throughout the state vary within greater limits 

 as to yield and representation of species, but probably show a higher 

 average than the uplands. The final class of forested lands which are 

 worthy of consideration are the sands supporting black-jack oak and 

 the gray clays supporting post oak. Yields of such stands are verj' low 

 and seldom produce any materials other than fuel, posts, and mine props. 



Sample St.\nds and Yields — Upland 



No. of trees per acre D. B. H. 6' 

 and up 



B. F. yield per acre 



Maximum D. B. H. 



inches 



Max. height, ft.. 



78.0 

 2467 



II. Even-aged imma 



ture fully stockrd stand, age "!! years. Whiteside county 

 Based on 1 acre 



Species 



White 

 oali 



Black 

 oak 



Cherry 



Elm 



Hickory 



Total 



No. of trees per acre 

 D B. H. 6" and up 



B. P. yield per acre. . 



Maximum D. B. H. 

 inches 



Max. height, ft 



111 



7482 



