42 



BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 



The Kubanka (C. I. No. 1516) leads in yield by an annual average 

 of about half a bushel in the 9-year period. This quantity is not 

 significant, and there is little choice among the four durum varieties 

 which were grown throughout this period. No varieties of any other 

 groups of durum wheat were under experiment during the periods 

 of years shown. 



RESULTS AT EDGELEY, N. DAK. 



The Edgeley substation of the North Dakota Agricultural Experi- 

 ment Station is located on a light sandy loam soil with a shale subsoil. 

 It lies at an altitude of 1 ,468 feet and has an average annual rainfall 

 of 18 inches for 15 years. The experiments were conducted inde- 

 pendently by the North Dakota Agricultural Experiment Station, 

 and the data presented are from the published annual reports of the 

 substation. Experiments were begun in 1903 and have been pub- 

 lished up to and including 191.3. 



The data found in Table XX were obtained from the annual 

 reports of the Edgeley substation of the North Dakota Agricultural 

 Experiment Station for the years 1903 to 1913, inclusive (Thomp- 

 son, 1904-1914), and the principal facts are portrayed graphically in 

 figure 12. Eleven-year records are given for five durum varieties 

 representing two different groups and for one variety in each of two 

 groups of spring common wheat. No continued attempt was made 

 to grow whiter wheat. The tabulated average yields show that all 

 five of the durums outyielded the best spring common varieties in 

 this period by 5 to 6 bushels per acre, which is equivalent to 30 per 

 cent or more. 



Table XX, — Annual and average yields of five varieties of durum wheat and four varieties 

 of common wheat grown at the Edgeley (TV". Dak.) substation during periods of varying 

 length in the eleven years from 1903 to 1913, inclusive. 



Class, group, and variety. 



C.I. 



No. 



Durum: 



Kubanka — 



Arnautka 



Pererodka 



Gharnovka 



Kubanka 



Velvet Don— Velvet Don 

 Common: 



Preston — Preston 



Bluestem — Haynes 



Fife— Rysting 



3693 



1350 

 1443 

 1440 

 1445 



2358 

 3021 

 3022 



Edge- 

 ley 

 No. 



Yield per acre (bushels). 



19.4 

 21.4 

 20.0 

 IS. 2 

 20.3 



1SS 

 2 15.1 

 319 



31.3 



25. 

 30.8 

 21.5 

 35.2 



11.6 

 11.6 



1905 



42.1 

 42.1 

 39.0 

 43.4 



43.2 



30.3 

 29.4 



27.2 

 23.8 

 23.8 

 21.4 

 19.3 



15.6 

 12.3 



13.8 

 11.0 

 12.5 

 13.2 

 L5.6 



1908 



13.5 

 13.7 

 12.9 

 11.3 

 11.3 



9.6 

 9.6 

 10.1 



27.0 

 29.0 

 28.5 

 28.5 

 29.6 



17.3 

 19.4 

 20.3 



32.9 

 31.3 

 22.6 

 33.4 

 23.0 



21.6 

 26.4 

 21.7 



1913 



25. 2 

 25.1 

 28.6 

 25.1 

 21.5 



26.9 

 21.5 

 25.2 



Average. 



6 



years, 



1908 



to 



1913. 



17.2 

 17.5 

 16.3 

 17.3 

 15.0 



14.4 

 14.3 

 14.2 



11 



years, 



" 1903 



to 



1913. 



21.5 

 20.7 

 20.4 

 20.1 

 20.3 



15.0 

 14.9 



