EXPERIMENTS WITH DURUM WHEAT. 



35 



(C. I. No. 1494), leads in the 7-year period in which it was grown. 

 The unselected Arnautka (C. I. No. 1493) stands next to Pelissier 

 in the 9-year period. In the first 7-year period, however, Yellow 

 Gharnovka of the Kubanka group is the highest yielder, followed by 

 Velvet Don, type of a different group, and Arnautka (C. I. No. 1493) 

 ranks third. The Yellow Gharnovka and Velvet Don were discarded 

 at the end of the seven years in spite of their high average rank, but 

 Beloturka and Kubanka were continued. The low average yield 

 of Kubanka is in part due to a poor stand obtained in 1909, which 

 resulted in a very low yield that year. Omitting 1909, which was 

 also the year of failure for winter wheat, the difference in yield 

 during the eight remaining years between the three varieties of the 

 Kubanka group is hardly significant. The Pelissier exceeds the best 

 of the Kubanka group in these eight years by 1.6 bushels, but in turn 

 is exceeded in yield by Crimean winter wheat by 3.1 bushels per acre. 



RESULTS AT NORTH PLATTE, NEBR. 



The North Platte substation is located in the valley of the South 

 Platte River, just above the junction of the North and South Forks. 

 It lies at an altitude of 3,000 feet and is located on the porous clay- 

 loam soil known as loess. The normal annual rainfall is 18.9 inches. 

 The cereal experiments were conducted independently by the 

 Nebraska Agricultural Experiment Station, and the results are 

 made available here through the courtesy of the director and his 

 associates. 



Table XV. — Annual and average yields of six varieties of durum wheat and three varieties 

 of common wheat grown at the North Platte (Nebr.) substation during periods of varying 

 length in the eleven years from 1906 to 1916, inclusive. 



[Data used by courtesy of the Nebraska Agricultural Experiment Station.] 





Yield per acre (bushels). 





1906 



1907 



1908 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



Average. 



Class, group, and variety. 



5 

 years, 

 1906 



to 

 1910. 



5 



years, 



1912 



to 



1916. 



11 

 years, 

 1906 



to 

 1916. 



Durum: 



Kubanka— 



■22.6 



31.4 



32.2 



28.0 



3.4 







6.7 

 3.2 

 6.5 



7.2 

 7.7 

 7.9 



3.0 

 3.9 

 2.3 



24.1 

 25.1 

 21.6 



20.0 

 19.5 

 19.9 



23.5 

 22.4 

 22.9 

 22.2 



12.2 

 11.9 

 11.6 



16 2 







Kubanka » 



Kahla — 



Black Don 



IS. 6 

 22.8 



33.0 

 28.6 



30.3 

 32.5 



26.5 



27.2 



3.5 

 3.5 







15." 5 



Kahla 





6.7 



5.1 



9.9 



4.6 

 3.0 



9.8 

 8.9 



16.8 

 6.8 

 3.0 



2.9 

 4.0 



8.0 

 4.3 

 3.0 



19.2 



37.3 



20.2 



6.6 



18.4 



38.3 

 17.4 

 16.2 



11.4 





Velvet Don — Velvet Don.. 



23.4 



29.0 



30.8 



25.5 



2.5 









Common: 



Crimean (winter) — Tur- 

 key b 



22.1 



10.7 

 6.4 





Fife — Marquis 

















Preston — Preston c 

































a Average yields from two plats. 



b Average yields from nine plats in the rotations of the Office of Dry-Land Agriculture Investigations. 



c (This variety was grown under the name Scotch Fife. 



