26 BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 
On the average, the durum varieties are the better at Crookston. 
Winter wheat can not be grown successfully in this locality, and only 
the Marquis approaches closely the best durums in yield. Among the 
three durum varieties under test, the Kubanka and a pure-line selec- 
tion (Minn. No. 951) closely resembling Arnautka are better adapted 
than the Velvet Don. The Arnautka selection, which has been 
named Mindum by the Minnesota Agricultural Experiment Station, 
outyielded Kubanka in the 5-year test by 1.3 bushels per acre. Here, 
as at Brookings, S. Dak., Arnautka has proved to be slightly better 
adapted than Kubanka. The close agreement in yield between the 
Glyndon, Haynes, and Preston varieties is remarkable, showing that 
here all three groups of hard spring common wheat are at home. 
Farther east only the Bluestem group does well, but farther west it 
is decidedly inferior to the other two. 
RESULTS AT FARGO, N. DAK. 
Fargo is located on a heavy black clay loam at an altitude of 935 
feet above sea level. Its normal annual rainfall is 24.9 inches. These 
data, in comparison with those from all the other stations, will be 
found in Table II (p. 15). The experiments here were conducted 
cooperatively by the North Dakota Agricultural Experiment Station 
and the Office of Cereal Investigations. The results obtained are pre- 
sented in Table XL The principal data are shown graphically also 
in figure 8. 
The experiments cover seven years, 1901 to 1904, inclusive, and 
1906 to 1908, inclusive. Eleven varieties of durum wheat are 
included, of which 10 belong to the Kubanka group. It is striking 
that among the 7-year average yields of these 10 there is a range 
of only 2.9 bushels. This difference is scarcely significant when the 
lowest and highest yields are, respectively, 33 and 35.9 bushels per 
acre. The difference in yield between the now commonly grown 
varieties, Arnautka and Kubanka, is not significant, although the 
slight difference is in favor of Kubanka. Here again the durums all 
outyield the best representatives of the standard spring common 
wheats by quantities that usually are significant. Winter wheat can 
not be grown successfully in this locality. 
The Bluestem slightly excels Fife, and that in turn outyields 
Preston. In 1904, the year of a severe rust epidemic, the durums 
yielded better than common wheats. In 1906, however, the Blue- 
stem outyielded all durums except Arnautka. A summary of the 
results shows that durum wheat yielded better than common wheat 
in the Red River Valley in the 7-year period, a conclusion fully in 
accord with farm yields in that district. Since 1908 the experi- 
ments have been conducted independently by the North Dakota 
Agricultural Experiment Station, but the results are not yet avail- 
able. 
