20 
BULLr.±lN 1113, U. S. DEPARTMENT OF AGRICULTURE. 
tiie Forest Service nursery, Halsey. Xebr., and grown for one year at 
Mandan, N. Dak., were sent out to 23 selected farmers. These plant- 
ings were almost total failures on account of the very dry soil condi- 
tion at the time they were set out. 
In 1920, shipments to cooperators totaled 124,183 trees. The dis- 
tribution of the shipments by species and States is given in Table 5. 
The year 1920 was one of drought over nearly the entire terri- 
tory, making the fourth year in succession in which the rainfall 
was below normal. Tartarian maple and buffalo berry were used 
Table 6. — Summary of Tables 3 to 5, inclusive, showing tlie total number of 
trees of all species shipped to cooperators in each State for each year of the 
■"'-Hear period from 1916 to 1920, inclusive. 
| State. 
1916 
1917 
1918 
1919 
1920 
Total. 
Montana 
451,554 
131,803 
83,923 
34,631 
226, 870 
84, 559 
31,931 
14, 340 
84,516 
30,688 
20,240 
6,858 
79,906 
62, 146 
16,651 
3,859 
67, 463 
29,264 
20,071 
7,385 
910,309 
338,460 
172, 816 
67,073 
Total 
701,911 
3.37, 700 
142,302 
162, 566 
124, 183 
1,488,658 
for the first time in a few places. Coniferous plantings were again 
almost total failures, on account of dry soil conditions. It is prob- 
able that this type of tree can only be established in years of favor- 
able rainfall. 
Northwest poplar, which had grown successfully in test plant- 
ings at Mandan for four years, was sent out for the first time 
to a few selected cooperators. 
Table 7. — Number of cooperative shelter belts planted each year, the number 
of each year's planting* listed as successful or as having failed on Janu- 
ary 1, 1921, and the percentage of failures. 
Year. 
Number 
planted. 
Number 
success- 
ful on 
Jan. 1, 
1921. 
Number 
that had \ Percent- 
failed by age of 
Jan. 1, 1 failures. 
1921. 
1 
1916 
633 
232 
75 
202 
92 
319 
117 
37 
154 
89 
314 
115 
38 
48 
3 
49.6 
1917 
49.5 
1918 
50.6 
1919. 
23.7 
1920 
3.3 
Total 
1,234 
716 
518 
42.0 
In Table 6 the shipments of trees to cooperators during the 5- 
year period from 1916 to 1920, inclusive, are summarized to show 
the number shipped to each State each year, the total shipment- 
each year, and the total number sent to each State in the five years. 
In the five years, 910,309 trees were shipped to Montana, 338,460 to 
North Dakota, 172,816 to South Dakota, and 67,073 to Wyoming. 
The total number of trees in shipments to the four States in the five 
years was 1.488.658. 
