32 BULLETIN 878, U. S. DEPARTMENT OF AGRICULTURE. 
RESULTS AT AKRON, COLO. 
The Akron Field Station of the Office of Dry-Land Agriculture at 
Akron, Colo., lies at an altitude of 4,560 feet on a sandy loam soil. 
The average annual precipitation for the past 16 years was 17.97 
inches. Experiments with spring wheat have been conducted here 
since 1908 in cooperation with the Office of Dry-Land Agriculture 
The yields are shown in Table XIII. 
During the 5-year period from 1908 to 1912, inclusive, most of the 
durum varieties considerably outyielded all common varieties except 
Galgalos. The Beloturka durum was the highest yielding variety, 
averaging 21.2 bushels per acre. During the 7-year period from 1913 
to 1919, inclusive, the Marquis compared favorably with the durum 
wheats, yielding 12.6 bushels per acre and outyielding even Belo- 
turka and Kubanka (C. I. No. 1440). Other durum wheats, how- 
ever, proved better yielders in this later period. Peliss was the lead- 
ing variety, yielding at the rate of 14.8 bushels per acre, or a signifi- 
cant difference of 2.2 bushels more than Marquis. Of the other 
durum wheats the Arnautka has yielded best. Several common 
wheats also have outyielded the Marquis, among them Galgalos and 
Erivan during the full period, and Prelude and Pioneer during the 
five years from 1915 to 1919, inclusive. The Prelude outyielded it 
by the greatest difference, averaging 2 bushels per acre more, although 
the Marquis outyielded it in three out of the five years. Not all of 
these differences are significant. In a long period of years, however, 
the Prelude might be the best common variety to grow. 
SUMMARY OY YIELDS. 
In order to compare the yields of varieties at all of the 11 stations, 
the average yields of each variety have been expressed in percentages 
of the yield of the Marquis variety during the same years at each 
station. These are given in Table XIV. A diagram showing the 
location of the 11 field stations and the average yields of the leading 
commercial varieties, in percentage of yields of the Marquis variety, 
at each station is shown in figure 1. The Marquis has been included 
in all of the experiments, and its yields here given include 66 station 
years. Other varieties have been grown during only a part of these 
years. The number of years that each variety has been grown at 
each station is indicated. 
A study of Table XIV shows that, in general, the Marquis is the 
highest yielding variety of common spring wheat grown in experi- 
ments at 11 field stations in the northern half of the Great Plains 
area. It has been outyielded by only a few other varieties at some 
of the stations. The Power Fife has produced higher yields than 
Marquis at WillisJton, N. Dak., Havre, Mont., and Sheridan, Wyo. 
The Preston has yielded more than Marquis only at Willis ton, N. 
Dak. The yields of Haynes Bluestem are only 41 to 94.4 per cent 
