40 



BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 



The data presented in Table XVIII and shown graphically in figure 

 12 cover a period of eight years, from 1909 to 1916, inclusive. Only 

 three varieties, one durum and two spring common wheats, were 

 grown throughout the period. The 8-year average yield of the 

 Kubanka durum is nearly double that of Preston and more than 

 double that of Dakota Bluestem. The same facts are apparent in 

 comparing the average yields of the same varieties in the last three 

 years, 1914 to 1916, inclusive. During this period, however, Marquis 

 was grown. This variety produced a yield 5.7 bushels higher than 

 that of Preston and only 3.3 bushels lower than that of Kubanka. 



Table XVIII. — Annual and average yields of one variety of durum wheat and three 

 varieties of common wheat grown at the Eureka (S. Dak.) substation during periods of 

 varying length in the eight years from 1909 to 1916, inclusive. 



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





C. I. 



No. 



Yield per acre (bushels). 



Class, group, and variety. 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



Average. 





3 years, 

 1914 to 

 1916. 



8 years, 

 1909 to 

 1916. 



Durum: 



Kubanka— Kubanka 



Common: 



1440 



3641 



3081 

 3083 



22.5 



10.7 











15.1 



9.3 



9.7 

 10.7 

 . 6.6 



42.9 



35.5 



22.9 

 18.5 



10.3 



7.4 

 1.7 



.4 



20.8 



17.5 

 11.8 



8.5 



13.9 





12.5 

 10.1 



3.8 

 2.3 





 



1.5 

 5.2 



7.7 

 8.7 



7.6 



Bluestem — Dakota 



6.5 



Beyond question, the durum wheats are better adapted to this 

 district than are any spring common wheats yet known. Although 

 no other variety than Kubanka has been grown, the evidence from 

 other stations similarly located indicates Kubanka to be the best 

 variety under these conditions. 



RESULTS AT NEWELL, S. DAK. 



The Belle Fourche Experiment Farm is located at an altitude of 

 2,900 feet on the Belle Fourche Reclamation Project, northeast of 

 the Black Hills. The soil is a heavy clay with shale subsoil, known 

 geologically as Pierre clay and popularly as gumbo. The average 

 annual rainfall is only 14.1 inches, as shown by the records of eight 

 years. The station is maintained by the Office of Western Irrigation 

 Agriculture, and the cereal experiments are conducted by the Office 

 of Cereal Investigations in cooperation with that office, and since 

 1912 in cooperation with the South Dakota Agricultural Experiment 

 Station. Though the station is irrigated, the experiments discussed 

 were conducted under dry-land conditions on ground wholly above 

 the ditch. 



