EXPERIMENTS WITH DURUM WHEAT. 
35 
(C. I. No. 1494), leads in the 7-year period in which it was grown. 
The unselected Arnautka (C. I. No. 1493) stands next to Pelissier 
in the 9-year period. In the first 7-year period, however, Yellow 
Gharnovka of the Kubanka group is the highest yielder, followed by 
Velvet Don, type of a different group, and Arnautka (C. I. No. 1493) 
ranks third. The Yellow Gharnovka and Velvet Don were discarded 
at the end of the seven years in spite of their high average rank, but 
Beloturka and Kubanka were continued. The low average yield 
of Kubanka is in part due to a poor stand obtained in 1909, which 
resulted in a very low yield that year. Omitting 1909, which was 
also the year of failure for winter wheat, the difference in yield 
during the eight remaining years between the three varieties of the 
Kubanka group is hardly significant. The Pelissier exceeds the best 
of the Kubanka group in these eight years by 1.6 bushels, but in turn 
is exceeded in yield by Crimean winter wheat by 3.1 bushels per acre. 
RESULTS AT NORTH PLATTE, NEBR. 
The North Platte substation is located in the valley of the South 
Platte River, just above the junction of the North and South Forks. 
It lies at an altitude of 3,000 feet and is located on the porous clay- 
loam soil known as loess. The normal annual rainfall is 18.9 inches. 
The cereal experiments were conducted independently by the 
Nebraska Agricultural Experiment Station, and the results are 
made available here through the courtesy of the director and his 
associates. 
Table XV. — Annual and average yields of six varieties of durum wheat and three varieties 
of common wheat grown at the North Platte (Nebr.) substation during periods of varying 
length in the eleven years from 1906 to 1916, inclusive. 
[Data used by courtesy of the Nebraska Agricultural Experiment Station.] 
Yield per acre (bushels). 
1906 
1907 
1908 
1909 
1910 
1911 
1912 
1913 
1914 
1915 
1916 
Average. 
Class, group, and variety. 
5 
years, 
1906 
to 
1910. 
5 
years, 
1912 
to 
1916. 
11 
years, 
1906 
to 
1916. 
Durum: 
Kubanka— 
22.6 
31.4 
32.2 
28.0 
3.4 

6.7 
3.2 
6.5 
7.2 
7.7 
7.9 
3.0 
3.9 
•2.3 
24.1 
25.1 
21.6 
20.0 
19.5 
19.9 
23.5 
"22." 4 
22.9 
"22."2 
12.2 
11.9 
11.6 
10.2 
Kubanka a 
Kahla— 
IS. 6 
22.8 
33.0 
28.6 
30.3 
32.5 
26.5 
27.2 
3.5 
3.5 

15.* 5 
Kahla 
6.7 
5.1 
9.9 
4.6 
3.0 
9.8 
8.9 
16.8 
6.8 
3.0 
2.9 
4.0 
8.0 
4.3 
3.0 
19.2 
37.3 
20.2 
6.6 
18.4 
38.3 
17.4 
16.2 
11.4 
23.4 
29.0 
30.8 
25.5 
2.5 

Common: 
Crimean (winter) — Tur- 
22.1 
j 10.7 
6. 4 
a Average yields from two plats. 
b Average yields from nine plats in the rotations of the Office of Dry-Land Agriculture Investigations. 
c This variety was grown under the name Scotch Fife. 
