ore. « 
‘<a Me 
AL SA Ee a ea 
eee a Peres 
warranted. 
sources. 
trial. 
NORTHERN GREAT PLAINS FIELD STATION, 1913-1922 9 
It is also desirable to test the same species from different 
For these reasons, some of the species included in the 
following list of failures also appear in the list of those still under 
The following is a list of species that have been planted in the 
species testing block and have not so far been successful: 
Acer platanoides, Norway maple. 
Betula alba, white birch. 
Betula lutea, yellow birch. 
Betula papyrtfera, canoe birch. 
Betula populifolia, gray birch. 
Betula sp., 
Fraxinus americana, white ash. 
Gleditsia triacanthos, honey locust. 
Hicoria ovata, hickory. 
birch. 
Juglans nigra, black walnut. 
Ostrya virginiana, hop hornbeam. 
Picea abies, Norway spruce. 
Pinus flexilis, limber pine. 
Populus alba nivea, silver poplar. 
Populus sp., poplar (S. P. I. No. 22447). 
Quercus alba, white oak. 
Quercus borealis, red oak. 
Quercus coccinea, scarlet oak. 
Quercus macrocarpa, bur oak. 
Quercus palusiris, pin oak. 
Robinia pseudoacacia, black locust. 
Salix acutifolia, sharpleaf willow. 
Salix daphnoides, Caspian willow. 
Salix sp., willow (S. P. I. No. 17737). 
TaBLE 6.—Year of planting, spacing, number of rows, and arrangement of species 
of trees in 22 shelter-belt combinations grown at the Northern Great Plains Field 
Station 
| 
Combina- | Year | e pac: Number 
tion planted | (feet) of rows 
INOS 2 22 1915  4by4 12 
<i 1915 4by4 16 
IN@3 eae | 1915 | 4by 4 22 
INO. 422." - 2. | 1915 | 4by4 20 
MO: 5.2.) | 1915 | 2by8 16 
Nine 1915 | 2by8 20 | 
| 
a | 1915 | 4by4 8 | 
INOS8=s-----|- 1916 |:4 by-8 2 
SC ee | 1916 | 4by8 3 | 
Raz1 0" <> | 1916 | 4by8 4 | 
MoT | 1916 | 4by8 5 | 
INO 022— A= 1916 | 4by8 6 
INiGesl oes 1916 | 4by8 8 
No. 14.-.:_| 1916 | 4by8 10 
NOs 15 = 5) 1916 | 4by4 18 | 
kt 1916 | 4by 4 9 
Wosl7=< 1916 | 4by4 4 
hos 18.)- 1917 6by 12 6 | 
ig 191) 1917 | 4by4 10 
| 
No. 20___--- 1917 | 4by8 5 | 
iN) eee 1917 | 4by 4 20 | 
| 
No. 22____.. 1917 | 4by8 10 | 
| 
5381—25}——2 
Arrangement of tree species (from east to west) 
Alternate rows of killdeer birch and green ash. 
Two rows each of chokecherry, box elder, green ash, Carolina 
poplar, box elder, laure} willow, Russian golden willow, and 
chokecherry. 
Wild plum, 2 rows; alternate rows of box elder and green ash, 8 
rows; alternate rows of Carolina poplar and Russian golden 
willow, 8rows; diamond willow, 2rows; and wild plum, 2rows. 
Caragana, 2 rows; green ash, Carolina poplar, box elder, and 
laurel-willow, 4 rows each; and caragana, 2 rows. 
Caragana, box elder, green ash, Carolina poplar, box elder, laurel 
willow, Russian golden willow, and caragana, 2 rows each. 
Caragana, 2 rows; alternate rows of green ash and box elder, 8 
rows; alternate rows of Carolina poplar and laurel willow, 8 
rows; and caragana, 2 rows. 
Green ash and Russian golden willow, alternate rows. 
| Caragana and laurel willow, 1 row each. 
| Caragana, Carolina poplar, and laurel willow, 1 row each. 
porseaus, Norway poplar, box elder, and laurel willow, 1 row 
each. 
_ Russian golden willow, box elder, poplar, box elder, and laurel 
willow. 
| Russian golden willow, 1 row; alternate rows of poplar and box 
elder, 4 rows; and laurel willow, 1 row. 
| Caragana, 1 row; laurel willow, 1 row; and alternate rows of pop- 
lar and Russian golden willow, 6 rows. 
| Laurel willow, 2 rows; alternate rows of poplar sp. and box elder, 
7 rows; and Russian golden willow, 1 row. 
| Laurel willow, box elder, green ash, box elder, poplar, box elder, 
poplar, box elder, and laurel willow, 2 rows each. 
_ Box elder, Russian golden willow, box elder, poplar, box elder, 
green ash, box elder, laurel willow, and boxelder. (Trees in 
| rows 1 and 9 are 2 feet apart.) é 
| Caragana, box elder, green ash, and laurel willow. (Trees in 
rows 1 and 4 are 2 feet apart.) 
Box elder, green ash. dwarf Asiatic elm, northwest poplar, kill- 
deer birch, and sharpleaf willow. 
Buffalo berry, sharpleaf willow, box elder, green ash, dwarf 
Asiatic elm, northwest poplar, killdeer birch, green ash, box- 
elder, and sharpleaf willow. 
| Buffalo berry, box elder, dwarf Asiatic elm, killdeer birch, and 
sharpleaf willow. 
Buffalo berry, sharpleaf willow, red laurel-leaf willow, box elder, 
killdeer birch, box elder, green ash, box elder, northwest poplar, 
dwarf Asiatic elm, box elder, green ash, killdeer birch, north- 
west poplar, box elder, green ash, killdeer birch, red laurel-leaf 
willow, sharpleaf willow, and killdeer birch. 
Buffalo berry, sharpleaf willow, killdeer birch, northwest poplar, 
dwarf Asiatic elm, killdeer birch, green ash, boxelder, red 
laurel-leaf willow, and killdeer birch. (Trees in rows 1 and 10 
are spaced 2 feet apart.) 
