EXPERIMENTS WITH DURUM WHEAT. 



23 



three periods of years mentioned. During the last five years of the 

 test, however, the Kubanka has the advantage. 



The results show that durum wheats of the Kubanka group are 

 profitable varieties for the Big Sioux Valley. They have outyielded 

 all spring common wheats except Marquis. 



Table VII. — Annual and average yields of eight varieties of durum wheat and five varieties 

 of common wheat grown at the South Dakota Agricultural Experiment Station, Brook- 

 ings, S. Dak., during periods of varying length in the thirteen years from 1904 to 1916, 

 inclusive. 



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



Class, group, and 

 variety. 



Durum: 



Kubanka — 

 Arnautka 



Do. 



Kubanka. 



Do. 



Do. 



Do. 



GharnovVa 



Kubanka. . 



Common: 



Vreston — Pres- 

 ton 



Fife— 



Marouis . . . 



Rysting. . . 



B 1 u e s t e m— 



Haynes 



Crimean (win- 

 ter) — Turkey 



C.I. 



No. 



Yield per acre (bushels). 



19041905190619071908 



1494 26. 

 149323.5 



1440 

 1541 

 1516 

 1354 

 1546 

 1490 



30N1 



3641 



3022 



18. S 

 IS. 6 

 19.3 

 21.0 

 16.1 

 22.5 



2874.... 

 3055'21. 



25. 35. 8 20. 8 

 25. 36.4117. 5 



16.3 

 16.5 



20.8 

 18.8 

 22. 2 

 18 5 



30.4 

 30.3 



38. 5 

 32. 5 

 28 4 



12.7 



25.8 

 23.1 

 16.1 

 15.8 



6.2,12.8 

 15.616.0 

 13.8 20.1 

 11.112.6 



18.3 22.310.915.0 



15.8 

 16.3 

 22.0 



21 8 

 8.0 



7.3 14.9 



8.4 11.6 

 9. 4 (d) 



1909 1910 1911 



16.5 

 17.3 

 11.8 

 18.0 

 15.7 



21.8 



15.5 

 16.9 

 14.4 



12.0 4.0 



11. 



12. 7j 1.2 



9.2 3.8 



5.5, 2 



19.0 2.8 



16.91 3.0 



15.7 2.8 

 (*) ( d ) 



1912 



26.1 

 31.0 

 .28.0 

 21.6 



28.6 



18.5 



16.8 

 cl5 

 29.3 



1913 



25.8 

 '28.3 



1911 



1915 



11.2 22.5 



15.017.0 



27. 6 12. 7 



29. 3: 15. 8 

 69.2 



20.0 

 c20.2 

 34.2 



2.5 

 30. S 



1916 



all.l 



ii.'e 



26.7 

 67.5 



12.5 

 43.3 



7.2 

 62.6 



.6 

 26.1 



Average. 



years , years. 



1904 



to 



1908. 



26.7 

 25.1 

 18.9 

 18.8 

 17.9 

 22.0 

 20.9 

 18.6 



1904 



to 



1912. 



21.3 



20.5 

 16.4 

 16.3 

 15.8 



12 



years, 



1905 



to 



1916. 



19.7 



12.7 

 12.1 



a Not grown; yield of Arnautka (C. I. No. 4064), a pure line selection from C. I. No. 1494, substituted. 

 6 Not grown; yield of Glyndon (O. I. No. 2873) substituted. 

 c Not grown; yield of Haynes (Minn. No. 185) substituted. 

 d Winter wheats not grown. 



RESULTS AT ASHLAND, WIS. 



Ashland, as seen in Table II (p. 15), lies on the Superior red clay 

 at the low altitude of 615 feet above sea level. The average annual 

 rainfall is 28.4 inches in a 16-year period. The experiments pre- 

 sented in Table VIII and shown graphically in figure 8 were con- 

 ducted by the Wisconsin Agricultural Experiment Station. The 

 data have been taken from Bulletin 233 of that station (Delwiche 

 andLeith, 1913). 



The experiments continued during the four years from 1908 to 

 1911, inclusive. The yields of one durum, Kubanka, and three 

 common varieties, representing three leading groups of hard spring 

 common wheat, are presented. One winter wheat, Kharkof, of the 

 Crimean group, also was grown. Since Ashland is near the northern 

 edge of the winter-wheat belt, it is not surprising that the Kharkof 

 does not excel all the spring varieties. 



