EXPERIMENTS WITH DURUM WHEAT. 



57 



inches on the basis of 44-year records. The substation was estab- 

 lished to conduct experiments with cereals and was maintained 

 cooperatively by the California Agricultural Experiment Station 

 and the Office of Cereal Investigations. 



Table XXXII. — Annual and average yields of six varieties of durum wheat and four 

 varieties of common wheat grown at the Modesto (Cal.) substation during periods of 

 varying length in the three years from 1907 to 1909, inclusive. 



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





C.I. 



No. 





Yield 



per acre (bushels). 



Class, group, and variety. 



1907 



1908 



1909 



Average. 



2 years, , 

 l oris " years, 

 an| 1907 to 

 1909. 1909 - 



Durum: 



Kubanka — 



2235 

 2221 

 2246 

 2096 

 2247 

 1597 



1596 



1970 

 3019 

 2989 



9.7 



"h'.X 



16.2 

 9.0 



13.1 

 6.7 



44.7 

 26.8 

 30.8 

 31.8 

 32.8 

 32.8 



67.3 

 69.3 

 51.3 

 33.2 



33.3 

 26.5 

 21. S 

 18.0 

 14.2 

 13.3 



56.0 

 55.0 



44.0 

 39.1 



39. 29. 3 





26.7 -. . . 



Do 



26.3 .. 





24.9 . 





23. 5 IS. 1 





23.1 ... 



Common: 



61. 7 46 5 





62.2 



47.7 

 36.2 



44.4 





36.1 





26.3 







The yields obtained in experiments continued for three years, 

 1907 to 1909, inclusive, are shown in Table XXXII, and the principal 

 facts are shown graphically in figure 13. Six varieties of durum 

 wheat, belonging to three separate groups, were included during 

 two years, and two of them during all three years. Four varieties of 

 common wheat, two with hard red kernels and two with soft white 

 kernels, were compared with the durum varieties. Among the 

 durums, Marouani easily takes first place. Here, as at Chico, how- 

 ever, only a glance is needed to show the marked superiority of the 

 common wheats. As at other points west of the Rocky Mountains, 

 durum varieties are not the best adapted wheats for growing in 

 California. 



SUMMARY OF RESULTS. 



The average yield of the highest yielding durum wheat at each 

 of the 30 stations discussed in this bulletin is presented in Table 

 XXXIII. In parallel columns is shown the average yield of the best 

 variety in each of the groups of common wheat, both winter and 

 spring, which were grown at the stations in the same period of years. 

 The length of the periods is shown in the second column. 



