NORTHERN GREAT PLAINS FIELD STATION, 1913-1922 Et 
TABLE 7.—Spacing and arrangement of species in the six blocks of the conifer com- 
binations and spacing experiment at the Northern Great Plains Field Station 
| Spac- 
Block | ing Arrangement of species from east to west 
| (feet) 
No. 1__.-..--------------| 2by 4 Scotch pine, jack pine, western yellow pine, Scotch pine, jack pine, 
. | ae western yellow pine. 
0. 
Do. 
Black Hills spruce, western yellow pine, jack pine, Scotch pine, and 
Black Hills spruce. 
O. 
5 
i 
12 
G 
| 
a 
woes icee 
imi 
se 
a7 
i Bate 
ee , | 
Fic. 2—Plan of the pruning, spacing, and methods of cultivationyexperiments with hardwood"shelter 
belts at the Northern Great Plains Field Station 
COOPERATIVE SHELTER-BELT DEMONSTRATIONS 
In 1915 a working cooperation with farmers living in the northern 
part of the Great Plains region was arranged, whereby the Depart- 
ment of Agriculture furnishes the trees, planting plans, and instruc- 
tions for starting shelter belts on their farms. ‘These shelter belts 
are designed to serve as demonstrations of the best methods of pre- 
