44 BULLETIN" 618, U. S. DEPARTMENT OF AGRICULTURE. 
The best average yield of any spring common wheat is slightly 
lower than the lowest average yield of any durum wheat in the same 
period of years. Among the common varieties, Glyndon has the best 
5-year average, 19.4 bushels per acre, while for the same period the 
average yield of Arnautka is 26.4 bushels per acre. All three of the 
standard spring common varieties are in close agreement in average 
yield during the 4-year and 5-year periods. 
At Langdon there is more difference between the yields of the 
different durum wheats than is usually the case. All four of the 
varieties in the Kubanka group distinctly outyield Velvet Don. 
Within the Kubanka group, Arnautka (C. I. No. 1494) leads, out- 
yielding Kubanka (C. I. No. 1349) by nearly 3 bushels per acre. 
These results substantiate further the results obtained at other 
stations in the Red River and Big Sioux valleys and territory adjacent 
thereto, showing the Arnautka variety to be best adapted to that 
section. 
RESULTS AT DICKINSON, N. DAK. 
The Dickinson substation of the North Dakota Agricultural Experi- 
ment Station is located on the border of the Heart River valley on a 
soil varying from sandy loam to clay loam. The elevation is 2,453 
feet, and the average annual precipitation has been 15.7 inches in a 
24-year period. The experiments were conducted cooperatively by 
the North Dakota Agricultural Experiment Station and the Office of 
Cereal Investigations. 
The results will be found in Table XXII, and the principal data in 
graphic form in figure 12. Experiments have been in progress for 11 
years, but the wheat crop of 1912 was destroyed by hail. Here, as 
elsewhere in the State, the durum varieties have outyielded all 
varieties of spring common wheat by quantities that are significant. 
Kubanka and Arnautka are the only durums grown throughout the 
10-year period. Here Kubanka has proved a slightly better yielder 
than Arnautka. In a 5-year period the two excel all other durums. 
During a 7-year period they in turn have been outyielded by a pure- 
line selection of Kubanka (C. I. No. 1440). This selection, first known 
as Kubanka No. 8, is now known as Cereal Investigations No. 4063. 
In this period it had an average yield of 3.3 bushels greater than the 
parent Kubanka. In the last 4 years of the test all the varieties were 
exceeded in yield by the new and more rust-resistant variety, dis- 
tributed as "Dl" but now named Monad. 1 
Among the spring common wheats, Fife leads in yield, with Preston 
next and Bluestem last. Only Rysting and Haynes have been grown 
throughout the period. In the last four years Marquis has produced 
1 This name is derived from mona, the Greek word for one, plus d, which stands for durum. This variety 
was obtained in Russia by Prof. H. L. Bolley, of the North Dakota Agricultural Experiment Station, 
and was further selected by him at Fargo. 
