10 



BULLETIN 400, U. S. DEPARTMENT OF AGKICULTTJEE. 



stations are Ames, Iowa; Lincoln, Nebr.; Brookings, S. Dak.; and 

 St. Paul and Crookston, Minn. 



Figure 3 shows by means of graduated colunms 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 suhhumid 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 1914 191 



26.23 

 16.58 

 24.05 

 16.20 



40.02 

 24.15 

 24.62 

 23.03 



38.66 

 36.81 

 20.42 

 30.79 

 20.11 



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 aU by 3 to 

 4 bushels to the acre. Representative heads and kernels of the 



