EXPERIMENTS WITH DURUM WHEAT. 
27 
Table XI. — Annual and average yields of twelve varieties-of durum wheat and three 
varieties of common wheat grown at the North Dakota Agricultural Experiment Station, 
Fargo, N. Dak., during periods of varying length in the seven years from 1901 to 1904 
and 1906 to 1908, inclusive a 
[Data obtained in cooperation with the North Dakota Agricultural Experiment Station.] 
Class, group, and variety. 
Durum: 
Kubanka — ■ 
Gharnovka 
Taganrog 
Pererodka 
Kubanka 
Yellow Gharnovka . . . 
Kubanka 
Beloturka 
Arnautka 
Argentine 
Gharnovka 
Velvet Don — Velvet Don 
Common: 
Bluestem — Haynes 
Fife— Power 
Preston — Preston 
CI. 
No. 
1447 
1570 
1350 
1349 
1444 
1440 
1513 
1494 
1569 
1443 
1445 
1505 
1506 
2958 
N. 
Dak. 
No. 
917 
911 
328 
329 
914 
929 
919 
778 
910 
915 
779 
920 
210 
Yield per acre (bushels). 
1901 
32.4 
29.7 
34.7 
32.4 
30.8 
32.4 
32.6 
34.0 
28.4 
31.4 
29.6 
29.7 
27.0 
24.9 
1902 
30.3 
31.7 
25.7 
28.7 
33.0 
28.7 
29.9 
28.7 
29.5 
25.8 
32.5 
21.2 
23.1 
25.0 
1903 
46.5 
46.7 
47.0 
44.0 
41.7 
44.0 
46.3 
43.4 
44.6 
44.5 
42.6 
39.3 
38.5 
38.7 
1904 
23.6 
18.5 
17.8 
17.6 
24.7 
21.9 
17.8 
20.5 
24.0 
20.8 
18.5 
15.2 
15.2 
7.1 
24.0 
25.3 
24.3 
22.0 
25.0 
24.3 
22.3 
27.3 
23.5 
24.6 
24.0 
26.3 
18.3 
1907 
47.8 
55.6 
54.6 
50.0 
49.5 
50.0 
53.1 
49.6 
52.5 
48.0 
48.1 
&32.2 
24.6 
191 IS 
47.0 
38.2 
39.2 
46.7 
36.4 
38.5 
36.7 
33.2 
29.2 
36.0 
35.5 
34.0 
c26.2 
Average. 
4 
years 
1901 
to 
1904. 
7 
years , 
'1901 
to 
1904 
and 
1906 
to 
33.2 
31.7 
31.3 
30.7 
32.6 
31.8 
31.7 
31.7 
31.6 
30.6 
30.8 
26.4 
26.0 
35.9 
35.1 
34.8 
34.5 
34.4 
34.3 
34.1 
33.8 
33.1 
33.0 
33.0 
28.3 
24.7 
a The crop of 1905 could not be harvested, owing to rain. 
b Yield of a selection (C. I. No. 3083, N. Dak. No. 316) from Haynes, C. I. No. 1505, substituted. 
c Yield of a selection (C. I. No. 3697, N. Dak. No. 313) from Power, C. I. No. 1506, substituted. 
RESULTS IN THE SEMIARID GREAT PLAINS AREA. 
The Great Plains area includes parts of all the States and Provinces 
from Texas on the south to Manitoba, Saskatchewan, and Alberta 
on the north. Koughly speaking, it extends from the line of 30-inch 
rainfall westward to the Kocky Mountains. Under this definition it 
includes part of the territory just discussed as in the subhumid 
section. The separation made in this paper between semiarid and 
subhumid is not exactly the one commonly used and is made here 
only in order to permit a better interpretation of the behavior of 
durum wheat. 
In altitude, this division rises from 1,000 or 1,500 feet on its east- 
ern border to 2,000 or 3,000 feet through its central portion, and to 
maximum altitudes in the west of 6,000 feet in eastern Wyoming 
and of 6,500 feet in east-central Colorado. Figure 10 is a contour 
map of the Great Plains area in the United States on which the 
altitudes are indicated by lines drawn on the contours of 1,000, 1,500, 
2,000, 3,000, 4,000, 5,000, and 6,000 feet. The drainage is to the 
southeast in the southern portion, to the. east in the central portion, 
and to the northeast in the northern portion. 
