EXPERIMENTS WITH DURUM WHEAT. 
45 
an average yield of 21.1 bushels, compared with 17.7 from EystiBf!£ a 
gain of 3.4 bushels. In the same period, however, the yields of the 
four durums range from 25.5 bushels to 30.2 bushels per acre, so that 
Marquis does not equal durum in this district. 
Table XXII. — Annual and average yields of seven varieties of durum wheat and five 
varieties of common wheat grown at the Dickinson (N. Dak.) substation during periods 
of varying length from 1906 to 1916, inclusive. - 
[Data obtained in cooperation with the North Dakota Agricultural Experiment Station.] 
C.I. 
No. 
Yield per acre (bushels). 
1906 
1907 
190S 
1909 
1910 
« 
1911 
1913 
1914 
1915 
1916 
Average. 
Class, group, and variety. 
4 
vears, 
1913 
to 
1916. 
5 
vears, 
1906 
to 
1910. 
9 
vears, 
1906- 
1911 
and 
1913- 
1915. 
Durum: 
Kubanka — 
Monad 
3320 
30.9 
13.6 
50.1 
26.2 
30.2 
28.3 
26.1 
25.5 
Kubanka 
4063 
43.2 19.9 
33.7, 14.9 
37.0 23.4 
36.0, 23.0 
36. 5| 15.7 
33.7 15.1 
3.5 
31.2! 13.0 
51.5, 17.4 
46.8 16. 6 
Do 
1440 
28.8 
36.0 
26.4 
28.4 
28.4 
?8 6 
23.5 
22.8 
18.8 
24.0 
17.6 
3.8 26.7! 14.2 
27.4 24.5 
Arnautka b 
Pererodka 
1494 
1350 
1493 
1444 
3641 
3022 
30S1 
2874 
1543 
24.3 
27.3 
24.3 
22.5 
c3.2 
30.9 11.6 
44.8 
14.6 
26.8 
26.7 
25.8 
23.5 
23.9 
1 
Yellow G h a r- 
novka 
Common: 
Fife- 
Marquis 
24.2 
14.0 
32.8 
25.6 
24.8 
22.9 

13.5 
4.5 
8.5 
3.1 
18.7 
21.1 
17.7 
14! S 
9.3 
Rysting 
22.6 i7.6 
22.3 33.0 
'2i.'4j*36."6 
20.7 
23.0 
(Z13.1 
7. 7 
9.7 
8.6 
28.1! 12.4 
25.2 12.9 
23.1 19.4 
Bluestem — Haynes. . . 
Crimean (winter)— 
Beloglina 
21.1 
14.0 
24.8 
9.1 
8.3 
9.2 
19.9 16.7 
a Crop of 1912 destroyed bv hail. 
b For 1906 to 1910, Arnautka (C. I. No. 1494); in 1913 to 1916, Arnautka 6P1 (C. I. No. 4064), a pure- 
line selection from C. I. No. 1494, made at Akron, Colo. 
c Not grown: yield computed from yield of Kubanka (C. I. No. 1400.) 
d Destroyed by hail; yield computed from Crossbred Bluestem (C. I. No. 3314). 
RESULTS AT WILLISTON, N. DAK. 
The Williston substation of the North Dakota Agricultural Experi- 
ment Station is on a fine sandy loam soil in the valley of the Missouri 
River at an altitude of 1,S75 feet. The normal annual rainfall is 
14.9 inches. The experiments at Williston have been conducted 
cooperatively by the North Dakota Agricultural Experiment Station 
and the Office of Cereal Investigations. 
The results of varietal trials with durum wheat and representative 
varieties of common wheat are presented in Table XXIII, and the 
leading data are shown graphically in figure 12. Six varieties of 
durum wheat, five of which belong to the Kubanka group, have been 
grown in periods varying from four to nine years. Velvet Don was 
outyielded by all varieties of the Kubanka group grown in the 6-year 
period from 1908 to 1912, inclusive. Kubanka and Arnautka are 
the only durum varieties grown throughout the 9-year period, 
