EXPERIMENTS WITH DUEUM WHEAT. 



27 



Table XI.— Annual and average yields of twelve varieties of durum wheat and three 

 varieties of common wheat grown at the North Dakota Agricultural Experiment Station, 

 Fargo, N. Dak., during periods of varying length in the seven years from 1901 to 1904 

 and 1906 to 1908, inclusive fl 



[Data obtained in cooperation with the North Dakota Agricultural Experiment Station.] 



Class, group, and variety. 



Durum: 



Kubanka — 



Gharnovka 



Taganrog 



Pererodka 



Kubanka 



Yellow Gharnovka 



Kubanka 



Beloturka 



Arnautka 



Argentine 



Gharnovka 



Velvet Don— Velvet Don . . . 

 Common: 



Bluestem — Haynes 



Fife — Power 



Preston — Preston 



C.I. 



No. 



1447 

 1570 

 1350 

 1349 

 1444 

 1440 

 1513 

 1494 

 1569 

 1443 

 1445 



1505 

 1500 



2958 



N. 

 Dak. 

 No. 



917 

 911 

 328 

 329 

 914 

 929 

 919 

 778 

 910 

 915 

 930 



779 

 920 

 210 



Yield per acre (bushels). 



32.4 

 29.7 

 34.7 

 32.4 

 30.8 

 32.4 

 32.6 

 34.0 

 28.4 

 31.4 

 29.6 



29.7 



27.0 

 24.9 



1902 



30.3 

 31.7 

 25.7 



28.7 

 33.0 

 28.7 

 29.9 

 28.7 

 29.5 

 25.8 

 32.5 



21.2 

 23.1 

 25.0 



1903 



46.5 

 46.7 

 47.0 

 44.0 

 41.7 

 44.0 

 46.3 

 43.4 

 44.6 

 44.5 

 42.6 



39.3 

 38.5 



38.7 



1904 



23.6 

 IS. 5 

 17.8 

 17.6 

 24.7 

 21.9 

 17.8 

 20.5 

 24.0 

 20.8 

 IS. 5 



15.2 

 15.2 

 7.1 



1906 



24.0 

 25.3 

 24.3 

 22.0 

 25.0 

 24.3 

 22.3 

 27.3 

 23.5 

 24.6 

 24.0 



26.3 

 18.3 



47.8 

 55.6 

 54.6 

 50.0 

 49.5 

 50.0 

 53.1 

 49.6 

 52.5 

 48.0 

 48.1 



632.2 

 24.6 



47.0 

 38.2 

 39.2 

 46.7 

 36.4 

 38.5 

 36.7 

 33.2 

 29.2 

 36.0 

 35. 5 



34.0 

 c26. 2 



4 



vears 



"1901 



to 



1904. 



33.2 

 31.7 

 31.3 

 30.7 

 32.6 

 31.8 

 31.7 

 31.7 

 31.6 

 30.6 

 30.8 



26.4 



28.0 

 23.9 



7 



vears, 



"1901 



to 



1904 



and 



1906 



to 



190S. 



35.9 

 35.1 

 34.8 

 34.5 

 34.4 

 34.3 

 34.1 

 33.8 

 33.1 

 33.0 

 33.0 



28.3 



24.7 



a The crop of 1905 could not be harvested, owing to rain. 



6 Yield of a selection (C. I. No. 30S3, N. Dak. No. 316) from Havnes, C. I. No. 1505, substituted. 



c Yield of a selection (C. I. No. 3697, N. Dak. No. 313) from Power, C. I. No. 1506, substituted. 



RESULTS IN THE SEMIARID GREAT PLAINS AREA. 



The Great Plains area includes parts of all the States and Provinces 

 from Texas on the south to Manitoba, Saskatchewan, and Alberta 

 on the north. Roughly speaking, it extends from the line of 30-inch 

 rainfall westward to the Rocky Mountains. Under this definition it 

 includes part of the territory just discussed as in the subhumid 

 section. The separation made in this paper between semiarid and 

 subhumid is not exactly the one commonly used and is made here 

 only in order to permit a better interpretation of the behavior of 

 durum wheat. 



In altitude, this division rises from 1,000 or 1,500 feet on its east- 

 ern border to 2,000 or 3,000 feet through its central portion, and to 

 maximum altitudes in the west of 6,000 feet in eastern Wyoming 

 and of 6,500 feet in east-central Colorado. Figure 10 is a contour 

 map of the Great Plains area in the United States on which the 

 altitudes are indicated by lines drawn on the contours of 1,000, 1,500, 

 2,000, 3,000, 4,000, 5,000, and 6,000 feet. The drainage is to the 

 southeast in the southern portion, to the east in the central portion, 

 and to the northeast in the northern portion. 



