EXPEEEMENTS WITH DURUM WHEAT. 



45 



an average yield of 21.1 bushels, compared with 17.7 from Rystmg, a 

 gain of 3.4 bushels. In the same period, however, the yields of the 

 four durums range from 25.5 bushels to 30.2 bushels per acre, so that 

 Marquis does not equal durum in this district. 



Table XXII. — Annual and average yields of seven varieties of durum wheat and five 

 varieties of common wheat grown at the Dickinson (N. Dak.) substation during periods 

 of varying length from 1906 to 1916, inclusive. 11 



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





C.I. 

 No. 



Yield per acre (bushels). 





1906 



1907 



1908 



1909 



1910 



1911 



1913 



1914 



1915 



1916 



Average. 



Class, group, and variety. 



4 

 years, 

 1913 



to 

 1916. 



5 



vears, 



1906 



to 



1910. 



9 

 years, 

 1906- 

 1911 

 and 

 1913- 

 1915. 



Durum: 



Kubanka — 



3320 

 4063 

 1440 

 1494 

 1350 

 1493 



1444 



3641 



3022 



30M 

 2874 



1543 















30.9 



31.2 

 26.7 

 30.9 



13.6 

 13.0 

 14.2 

 11.6 



50.1 



26.2 



30.2 

 28.3 







Kubanka 



28.8 

 24.3 

 27.3 

 24.3 



22.5 



36.0 

 26.4 

 28.4 

 28.4 



28.6 



23.5 

 22.8 

 18.8 

 24.0 



17.6 



33.7; 14.9 

 37.0 23.4 

 36.0 23.0 



3.5 

 3.8 

 c3.2 



51.5! 17.4 

 46.8 16- fi 





Do 



26.1 

 25.5 



27.4 

 26.8 

 26.7 

 25.8 



23.5 



24.5 



Arnautka & 



Pererodka 



44.8 



14.6 



23.9 



Arnautka 



36.5 

 33.7 



15.7 

 15.1 

















Yellow G h a r- 

 novka 





•| 











Common: 

 Fife- 

 Marquis 





24.2 14.0 



32.8 

 25. 6 

 24.8 

 22.9 







13.5 

 4.5 

 8.5 

 3.1 



18.7 



21.1 

 17.7 

 17.9 

 14.8 



9.3 





Rysting 



22.0 



17.6 



22.3 



33.0 



20.7 

 23.0 

 (213.1 



7.7 

 9.7 

 8.6 



28.1 

 25.2 

 24.8 



9.1 



12.4 

 12.9 

 8.3 



9.2 



23.1' 19.4 



Preston — Preston 





Bluestem — Haynes. . . 



Crimean (winter) — 



Beloglina 



21.1 



14.0 



21.4 



30.0 



19.9 



16.7 





















« Crop of 1912 destroyed by hail. 



& For 1906 to 1910, Arnautka (C. I. No. 1494); in 1913 to 1916, Arnautka 6P1 (C. I. No. 4064), a pure- 

 line selection from C. I. No. 1494, made at Akron, Colo. 



c Not grown; yield computed from yield of Kubanka (C. I. No. 1400.) 



d Destroyed by hail; yield computed from Crossbred Bluestem (C. I. No. 3314). 



RESULTS AT WILLISTON, N. DAK. 



The Williston substation of the North Dakota Agricultural Experi- 

 ment Station is on a fine sandy loam soil in the valley of the Missouri 

 River at an altitude of 1,875 feet. The normal annual rainfall is 

 14.9 inches. The experiments at Williston have been conducted 

 cooperatively by the North Dakota Agricultural Experiment Station 

 and the Office of Cereal Investigations. 



The results of varietal trials with durum wheat and representative 

 varieties of common wheat are presented in Table XXIII, and the 

 leading data are shown graphically in figure 12. Six varieties of 

 durum wheat, five of which belong to the Kubanka group, have been 

 grown in periods varying from four to nine years. Velvet Don was 

 outyielded by all varieties of the Kubanka group grown in the 6-year 

 period from 1908 to 1912, inclusive. Kubanka and Arnautka are 

 the only durum varieties grown throughout the 9-year period. 



