56 



BULLETIN" 618, U. S. DEPARTMENT OF AGRICULTURE. 



Plant Industry, and the cereal experiments are conducted in cooper- 

 ation therewith by the Office of Cereal Investigations. Data resulting 

 from experiments conducted in the years 1910 to 1916, inclusive, are 

 given in Table XXXI, and the principal facts are shown graphically 

 in figure 13. 



Table XXXI. — Annual and average yields of ten varieties of durum wheat and two 

 varieties of common wheat grown at the Plant Introduction Garden, Chico, Cat., during 

 ■periods of varying length in the seven years from 1910 to 1916, inclusive. 



[Data obtained in cooperation with the Office of Foreign Seed and Plant Introduction.] 





C. I. 



No. 



Yield per acre (bushels). 



Class, group, and variety. 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



Average. 



2 years, 

 1910 

 and 

 1911. 



7 years, 

 1910 to 

 1916. 



Durum: 



Kubanka — 



2216 

 2096 

 1593 

 1440 

 2221 

 1595 

 1494 

 2575 

 2227 



2235-2 



19.7 



9.6 



«10.7 



aS. 5 

 2.5 



36. 3 

 36.6 

 34.6 

 29.6 

 32.3 













28.0 

 23.1 

 22.7 

 19.1 

 17.4 











26.2 



























<*29.5 











Do 











Unnamed - 



21.3 

 25.0 

 30.0 



32.3 



29.7 



21.3 

 19.0 



18.0 



22.0 

























Velvet Don — Velvet Don 



20.0 



33.3 









26.7 





Kahla — 



26.3 



34.8 



27.7. 





20.1 



















11.8 



33.8 



25.7 



31.6 ! 23.6 



18.0 



21.1 





23.7 









Common: 



1097 

 3019 



39.3 

 28.0 



90.6 

 65.5 



27.5 

 631.5 



45.7 30.2 

 <-44.7 .634.7 



19.2 



18.6 



27.5 

 32.0 



65.0 



46.8 



40.0 



White Australian — White Aus- 



30.4 











a Average of two plats. 



6 Average of six plats. 



c Average of seven plats. 



All varieties are fall sown at Chico, and all are grown on summer- 

 fallowed land. No less than 10 different durum varieties have been 

 tested during the seven years, but none of them for more than three 

 years consecutively. For this reason it is almost impossible to 

 arrive at comparable average yields. However, only a glance is 

 needed to show that the durums are all greatly outyielded by the 

 two representative varieties of common wheat. This is true, in spite 

 of the fact that some good yields were obtained from the durum 

 varieties. In the comparison made between yields of durum and 

 varieties of two groups of common wheat in figure 13, the average 

 yield of all varieties of durum wheat grown is used. 



RESULTS AT MODESTO, CAL. 



The Modesto substation was located in the lower San Joaquin 

 Valley at an altitude of 90 feet. The soil is the sandy loam charac- 

 teristic of the valley. The average annual precipitation is 10.5 



