91 



Bottomland Light Soils 



Species Cuhic contents at iO years 



Even-aged All-aged 



Cottonwood 96.7 



Sycamore 62.9 



Soft maple 53.0 



Elm 2.0 



Bottomland Heavy Soils 



Species Cuiic contents at J/O years 



Even-aged All-aged 



Water locust 28.5 



Honey locust 25.8 



Soft maple 23.4 



Pin oak 23.6 18.0 



Ash 7.3 



Schneck's oak 6.2 



Swamp Spanish oak... 4.9 4.3 



Hackberry 3.3 



Elm 3.3 



Tupelo gum 2.6 



Hickory 1.5 



The minimum-sized tree suitable for ties or sawlogs averages about 

 10 inches stump D. I. B. and 60 feet in height. Such a tree contains ap- 

 proximately 13 cubic feet of wood in the peeled stem. Using this figure 

 as a standard, it is seen that, in the upland sandy loams, black walnut, 

 tulip-poplar, and black and white oaks are the only species which average 

 a sawlog tree at 60 years age. However, it is probable that red oak, bass- 

 wood, elm, and ash will make such trees if grown in even-aged stands. 



On the upland yellow and yellow-gray silt loams the species which 

 average a tree of minimum sawlog size or more at 60 years are white 

 pine, tulip-poplar, red oak, black oak, shingle oak, and ash ; while hickory, 

 hard maple, and white oak grow very slowly. 



White pine and black oak were the only two species studied on the 

 sand and each produces a merchantable tree in 60 years. On the heavy 

 loams of the post oak region neither post oak nor black oak made saw- 

 logs at 60 years. 



The bottomland soils produce several species of very rapid growth- 

 rates and 40 years is taken as the period of comparison. On the light 

 soils of the bottomland, sycamore, cottonwood, and soft maple have a 

 very high growth-rate, while elm fails to make trees of average sawlog 

 size in the 40-year period. 



On the heavy bottomland soils water locust, honey locust, soft maple, 

 and pin oak produce merchantable trees at 40 years, while ash, Schneck's 



