SPRING WHEAT OX THE XORTHERX GREAT PLAINS. 21 
Ainong the common wheats the Fretes has been the only variety 
which has out yielded Marquis. The difference of 0.6 bushel is not 
significant, however, and as the variety has a tendency to lodge, it can 
not be recommended for commercial growing. The Galgalos variety 
was discarded after 1915 because of its weak straw and its soft white 
kernel. The Power Fife has an average yield of 21.6 bushels, or a sig- 
nificant difference of 2.6 bushels per acre less than Marquis, in the 
seven years. The average yield of Rysting Fife has been nearly iden- 
tical with that of Power Fife. All other common wheats grown in 
shorter periods of years have on the average yielded less than Marquis. 
During the three years from 1917 to 1919 the Monad durum wheat 
has outyielded Marquis by a significant difference of 2.5 bushels per 
acre, but its yields have not been greater than those of Peliss in the 
same period. Other durum wheats which are being continued in the 
experiment have yielded somewhat more than the Marquis variety in 
the periods grown. 
RESULTS AT HIGH-MORE, S. DAK. 
The Highmore Substation of the South Dakota Agricultural Ex- 
periment Station is located near Highmore, S. Dak., on a glacial clay- 
loam soil at an altitude of 1,890 feet. The average annual rainfall 
has been 16.75 inches during the last 26 years. The cereal experi- 
ments have been conducted by the South Dakota Agricultural Ex- 
periment Station in cooperation with the Office of Cereal Investiga- 
tions since 1902. The more recent yields obtained are shown in 
Table YIII. 
From 1905 to 1912 nine varieties of wheat were grown continu- 
ously. In that 8-year period three strains of Kubanka durum wheat 
significantly outyielded all varieties of common wheat. Among the 
common wheats the Haynes (C. I. No. 2874) produced the highest 
average yield. During the 7-year period from 1913 to 1919, inclusive, 
the Marquis has been the highest yielding common wheat, producing 
an average of 15.5 bushels per acre. During the same period the 
Kubanka durum (C. I. No. 1440) has yielded at the rate of 15.8 
bushels or only 0.3 bushel per acre more and the Preston (C. I. No. 
3081) 14.1 bushels or 1.4 bushels less than the Marquis. The Marquis 
has significantly outyielded the Haynes variety, exceeding it in yield 
in each of the seven years. It also has outyielded all other varieties 
of common wheat and all but five of the durum varieties. In the 
6-year period from 1914 to 1919, inclusive, the Acme has been the 
highest yielding wheat. During that period it significantly out- 
yielded Marquis by 6.2 bushels per acre. Because of these excellent 
yields and the discovery of its rust resistance in 1916, the Acme has 
been increased and distributed commercially in many sections of 
South Dakota. About 5,000 acres were grown in 1919. In the three 
