SHELTER-BELT DEMONSTRATIONS ON THE GREAT PLAINS. 
15 
classifications of clay or silt loam, sandy loam, and sand or gravel 
and the moisture supply is derived entirety from the rainfall. Ex- 
ceptional planting sites are found where lack of drainage or nearness 
to streams and water tables affords a moist or low. wet soil condi- 
tion. Table 2 lists the several tree species according to their adapta- 
bility to the above rough classification. 
Table 2. — Adaptation of tree specie* to the several soil types or conditions on 
the Northern Great Plains. 
Clav or silt loam. 
>andv loam. 
Box elder 
Northwest poplar. 
Green ash 
White elm 
Caragana 
Buffalo berry 
Russian olive 
Chokecherrv 
Box elder Box elder. 
Northwest poplar. . Northwest poplar. 
Green ash 
Sand or gtavel. 
Caragana 
Buffalo berr y Buffalo berry . 
Russian olive Russian olive. 
Chokecherry 
Moist soils. 
White spruce 
Black Hills spruce 
Blue spruce 
Scotch pine 
White spruce 
Black Hills spruce 
White spruce 
Black Hills spruce 
Blue spruce 
Scotch pine 
Jack pine Jack pine 
Box elder 
Northwest poplar. . 
Green ash 
White elm 
Caragana 
Buffalo berry 
Russian olive 
Chokecherry 
Cottonwood 
White spruce 
Black Hills spruce 
Blue spruce 
Willow i. 
Low wet soils. 
Box elder. 
Northwest poplar. 
Green ash. 
White elm. 
Cottonwood. 
White spruce. 
Willow. 1 
-Laurel-leaf Russian golden, or diamond willow. 
Fig. 9. — A shelter belt planted in 1916 that is an effective factor in the development of a 
home on the treeless plain> at Fowler. Mont. Photographed in 1921. 
SHELTER-BELT PLANTING PLANS. 
The demonstration shelter belts are laid out in long belts ranging 
from 5 to 10 or more rows spaced 8 feet apart. In most of the 
plantings the trees have been placed 4 feet apart in the row. Re- 
cent observations made of the plantings set out in 1916 indicate 
that a wider spacing might be better, especially for the average 
site, in order that the individual trees may reach a larger size be- 
