10 
BULLETIN 400, U. S. DEPARTMENT OF AGRICULTURE. 
stations are Ames, Iowa; Lincoln, Nebr.; Brookings, S. Dak.; and 
St. Paul and Crookston, Minn. 
Figure 3 shows by means of graduated columns the average yield 
of Marquis wheat and of the leading variety in each of several groups 
of wheat during the 3-year period, 1913 to 1915, except as other- 
wise noted. The same data will be found in tabulated form in 
Tables III to VII, inclusive. 
The annual rainfall at each of these stations during 1913, 1914, 
and 1915, so far as available, and the average for the 3-year period, 
together with the elevation, are shown in Table II. The average 
annual rainfall at Ames, Iowa, not shown in the table, is about 40 
inches. From this there is a decrease at the other stations. Crook- 
ston, Minn., has the lowest average, a little less than 20 inches. 
Brookings, S. Dak., has the highest elevation. 
Table II. — Altitude, annual precipitation, and seasonal precipitation at five experiment 
stations in the northern Prairie States, or subhumid section, during 1913, 1914, and 
1915, except as otherwise noted. 
Station. 
Ames, Iowa 
Lincoln, Nebr 
Brookings, S. Dak 
St. Paul, Minn... 
Crookston, Minn . . 
Alti- 
tude. 
Feet. 
922 
1,189 
1,636 
837 
863 
Precipitation (inches). 
Annual. 
1913 
26.23 
16.58 
24.05 
16.20 
1914 
( 2 ) 
40.02 
24.15 
24.62 
23.03 
1915 
38. 66 
36.81 
20.42 
30.79 
20.11 
Aver- 
age. 
34.35 
20.38 
26.49 
19.78 
Seasonal. 1 
1913 1914 1915 
12.30 
10.69 
13.73 
8.62 
( 2 ) 
20.70 
14.09 
12.65 
14.38 
12.85 
11.81 
10.47 
14.74 
14.98 
Aver- 
14.94 
11.75 
13. 71 
12.66 
1 The records of seasonal precipitation include the months of April to June, inclusive, at Ames and 
Lincoln and the months of May to July, inclusive, at the other stations. 
2 No records available. 
The annual rainfall is usually sufficient for normal crop production. 
Nearly half of the annual precipitation falls during the four months 
of May, June, July, and August. The growing season is fairly long, 
varying from about 130 days to as many as 150 days. 
RESULTS AT AMES, IOWA. 
As shown in Table III, Marquis wheat has been grown only two 
years at this station. The data show that the hard red winter 
wheats of the Crimean group far outyield any spring wheats. The 
Marquis is compared, however, with three other spring wheats. 
These varieties represent the three different groups of hard spring 
common wheat which are extensively grown in the hard spring-wheat 
States. In these two years the Marquis outyielded them all by 3 to 
4 bushels to the acre. Representative heads and kernels of the 
