EXPERIMENTS WITH DUEUM WHEAT. 



53 



wheat to be 26 bushels, or an increase of 150 per cent over that of 

 Kubanka. Durum wheats were also tested at this station from fall 

 sowing, but the yields obtained were no larger than from spring 

 sowing. 



RESULTS AT ABERDEEX, IDAHO. 



The Aberdeen substation is located in the Snake River Plains of 

 southern Idaho on a sandy clay-loam soil containing some volcanic-ash 

 material. The altitude is 4,400 feet. The average annual precipi- 

 tation in the past four years has been only 9.5 inches, the lowest 

 recorded for any of the stations west of the Rocky Mountains. The 

 substation is maintained cooperatively by the Idaho Agricultural 

 Experiment Station and the Office of Cereal Investigations. 



The results obtained at Aberdeen are found in Table XXVIII and 

 the principal data in graphic form hi figure 13. Data on durum 

 wheats are available for only the last two years. These wheats are 

 compared with a representative variety from each of six different 

 groups of spring wheat and the Crimean group of winter wheat. The 

 average yields of all varieties are low in this 2-year period. Only 

 three out of nine varieties exceed 10 bushels per acre. The yields of 

 the durum are below the general average, being exceeded, or at least 

 equaled, by five of the six spring common varieties. Although data 

 for only two years are not conclusive, there is little reason for expect- 

 ing the durum varieties to be worthy of being grown in the Snake 

 River Basin. 



Table XXVIII. — Annual and average yields of Jive varieties of durum ivheat and seven 

 varieties of common wheat grown at the Aberdeen {Idaho) Branch Experiment Station 

 during 1915 and 1916. 



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



Class, group, and variety. 



CI. 



No. 



Yield per acre 

 (bushels). 



Class, group, and variety. 



C.I. 



Yield per acre 

 (bushels). 



1915 



1916 



Aver- 

 age. 



No. 



1915 



1916 



Aver- 

 age. 



Durum: 



Kubanka — 



Do 



4064 

 1493 

 1516 

 1520 

 1584 



1442 



7.2 

 4.5 

 6.3 

 5.4 

 6.3 



21.1 



8.3 



7.8 



C ommon — Continued. 

 White Australian— 



Pacific Bluestem. . . 



Preston — Fretes 



Fife — Marquis 



Baart — Early Baart. 

 Little Club — Little 



Club 



4067 

 1596 

 3276 

 1697 



4066 



2874 



9.0 

 10.8 

 6.3 

 7.5 



7.2 



5.4 



12.3 

 9.7 



11.3 

 9.7 



8.3 

 8.0 



10.7 

 10 3 



Kubanka 



8.7 



7.5 



8.8 

 8.6 











Cqmmon: 



3.5 



12.3 



7.8 



Crimean (winter) — 



Bluestem — Haynes. . 



6.7 











The 2-year average yield of the Crimean variety Kharkof also is 

 low, although its 12.3 bushels is the highest average of all. This is 

 lower than observation and experience show may reasonably be 

 expected from these wheats hi this section. 



