SHELTER-BELT DEMON STEATIOIsrS ON THE GREAT PLAINS. 



15 



classifications of clay or silt loam, sandy loam, and sand or gravel 

 and the moisture supply is derived entirely 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 species to the several soil types or conditions on 

 the Northern Great Plains. 



Clay or silt loam. 



Sandy loam. 



Box elder 



Northwest poplar. 



Green ash 



White elm 



Caiagana 



Buffalo berry 



Russian oUve 



Chokecherry 



White spruce 



Black HiUs spruce 



Blue spruce 



Scotch pine 



Box elder 



Northwest poplar. . 

 Green ash 



Caragana 



Buffalo berry. 

 Russian olive. 

 Chokecherry.. 



Sand or gravel. 



Box elder 



Northwest poplar . 



Buffalo berry. 

 Russian olive. 



White spruce 



Black HiUs spruce 



White spruce 



Black Hills spruce 



Blue spruce 



Scotch pine I 



Jack pine Jack pine 



Moist soils. 



Box elder 



Northwest poplar. 



Green ash 



^\^lite ehn 



Buffalo berry. 

 Russian olive. 

 Chokecherry 



ry 



Cottonwood 



White spruce 



Black Hills spruce 

 Blue spruce 



WiUowi. 



Low wet soils. 



Box elder. 

 Northwest poplar. 

 Green ash. 

 White elm. 



Cottonwood. 

 White spruce. 



WillGw.i 



'Laurel-leaf Russian golden, or diamond willow. 



Fig. 9. — A shelter Ixlt plantod In 1916 that is an effective factor in the development of a 

 home on the treeless plains 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- 



