40 
BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 
The data presented in Table XVIII and shown graphically in figure 
12 cover a period of eight years, from 1909 to 1916, inclusive. Only 
three varieties, one durum and two spring common wheats, were 
grown throughout the period. The 8-year average yield of the 
Kubanka durum is nearly double that of Preston and more than 
double that of Dakota Bluestem. The same facts are apparent in 
comparing the average yields of the same varieties in the last three 
years, 1914 to 1916, inclusive. During this period, however, Marquis 
was grown. This variety produced a yield 5.7 bushels higher than 
that of Preston and only 3.3 bushels lower than that of Kubanka. 
Table XVIII. — Annual and average yields of one variety of durum wheat and three 
varieties of common wheat grown at the Eureka (S. Dak.) substation during periods of 
varying length in the eight years from 1909 to 1916, inclusive. 
[Data obtained in cooperation with the South Dakota Agricultural Experiment Station.] 
C.I. 
No. 
Yield per acre (bushels). 
Class, group, and variety. 
1909 
1910 
1911 
1912 
1913 
1914 
1915 
1916 
Average. 
3 years, 
1914 to 
1916. 
8 years, 
1909 to 
1916. 
Durum: 
Kubanka — Kubanka 
Common: 
1410 
3641 
3081 
3083 
22.5 
10.7 


15.1 
9.3 
9.7 
10.7 
6.6 
42.9 
35.5 
22.9 
18.5 
10.3 
7.4 
1.7 
.4 
20.8 
17.5 
11.8 
8.5 
13.9 
12.5 
10.1 
3.8 
2.3 


1.5 
5.2 
7.7 
8.7 
7.6 
Bluestem — Dakota 
6.5 
Beyond question, the durum wheats are better adapted to this 
district than are any spring common wheats yet known. Although 
no other variety than Kubanka has been grown, the evidence from 
other stations similarly located indicates Kubanka to be the best 
variety under these conditions. 
RESULTS AT NEWELL, S. DAK. 
The Belle Fourche Experiment Farm is located at an altitude of 
2,900 feet on the Belle Fourche Reclamation Project, northeast of 
the Black Hills. The soil is a heavy clay with shale subsoil, known 
geologically as Pierre clay and popularly as gumbo. The average 
annual rainfall is only 14.1 inches, as shown by the records of eight 
years. The station is maintained by the Office of Western Irrigation 
Agriculture, and the cereal experiments are conducted by the Office 
of Cereal Investigations in cooperation with that office, and since 
1912 in cooperation with the South Dakota Agricultural Experiment 
Station. Though the station is irrigated, the experiments discussed 
were conducted under dry-land conditions on ground wholly above 
the ditch. 
