34 



BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 



data are for the nine years from 1908 to 1916, inclusive. Yields 

 are shown for 11 durum varieties tested during seven of these years 

 and of four for all nine years. The most striking fact is the close 

 agreement in yield of the best durum varieties and the Crimean 

 winter wheat. The average yield of the Crimean is reduced by its 

 complete failure in 1909. This was due, in part, to a treatment of 

 the seed with formaldehyde which was too severe, resulting in a 

 poor stand, which entirely winterkilled. 



Among the spring wheats, the ordinary Fife and Blues tern varie- 

 ties do not yield well at Akron, so the Fife group is represented by 

 Ghirka Spring, and in the last four years by Marquis also. The 

 Bluestem group is absent. The Preston group is represented by 

 Erivan from the Caucasus region. Neither Ghirka Spring nor 

 Erivan is able to compete with the best durum varieties in yield. 

 From the records made by the Marquis in the four years since it 

 was included in the test, it may prove to be more nearly equal to 

 the durums than any other spring common varieties. From the 

 data now available, however, the durums are the best spring wheats 

 to grow at this station. 



Table XIV. — Annual and average yield of eleven varieties of durum wheat and four 

 varieties of common wheat grown at the Akron Field Station, Akron, Colo., during 

 periods of varying length in the nine years from 1908 to 1916, inclusive. 



[Data obtained in cooperation with the Office of Dry-Land Agriculture.) 





C.I. 



No. 





Yield 



per acre (bushels). 











1908 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



Average. 



Class, group, and variety. 



7 



years, 



1908 



to 



1914. 



7 



years, 



1910 



to 



1916. 



9 



years, 



1908 



to 



1916. 



Durum: 



1584 



4064 

 1493 

 1520 

 1440 

 1444 

 1447 

 1354 

 1593 

 1445 

 3024 



1430 

 1517 

 3041 

 2397 



24.7 



23. 6 



15.8 



19.5 

 16.6 

 19.9 

 17.1 

 15.0 

 13.1 

 21.3 

 19.3 

 13.5 

 15.3 



36.3 



18.8 



10. 6 



15.7 

 10.6 



8.0 



9.0 

 10.8 



9.3 

 11.7 

 10.6 

 10.0 



7.9 



17.9 

 8.5 



35.6 



37.3 

 27.5 

 21.1 

 25.1 

 34.2 

 36.5 

 19.8 

 19.0 

 33.3 

 33.0 



33.1 

 23.4 



10.5 



10.6 

 10.5 

 10.6 

 5.1 

 5.3 

 3.3 

 13.6 

 14.1 

 7.3 

 10.0 



12.6 

 14.0 

 7.5 

 12.0 



20. 6 



25.0 

 27.6 

 19.5 

 20.7 

 22.5 



31.6 



27.6 

 27.9 

 26.7 

 27.6 



14.4 



11.4 

 10.7 

 11.4 

 12.9 



21.1 



20.1 

 18.5 

 16.2 

 20.9 

 19.3 

 19.2 

 17.7 

 20.5 

 19.0 



21.3 

 18.3 



20.7 



21.0 

 18.7 

 16.7 



10.8 



21.5 



Kubanka — 





Do 



26.9 

 31.1 

 26.8 

 32.8 

 29. 1 

 27.2 

 22.9 

 33.3 

 24.8 



19.1 



20. <i 



20.8 

 19.4 

 9.3 

 25.1 

 20.9 

 18.0 

 14.2 

 21.1 

 20.8 





 23.8 



19.9 



Beloturka 



18.6 

 17.1 







Gharnovka 



23.7 

 22.7 

 24.0 

 25.3 

 21.2 



28.3 

 19.3 

 16. 7 

 19.3 































Velvet Don — Velvet Don . . 





















Common: 



Crimean ( wi nter) — Crimean 

 Fife— Ghirka Spring 



26.6 

 22.6 

 26.5 

 19.5 



20.5 

 7.5 

 11.8 



7.8 



25.0 

 10.3 



21.6 

 17.6 





19.3 



26.3 



15.2 



11.9 



20.7 



17.8 



15.2 



16.9 







Considering only the durum wheats, Pelissier leads in the first 

 7-year average and the 9-year average and almost ties with Arnautka 

 for first place in the second 7-year average. In the Kubanka group 

 a pure line, Arnautka 6P1 (C. I. No. 4064), a selection of Arnautka 



