56 
BTTLLETIX 618, TJ. S. DEPAETMEXT 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 reheat grown at the Plant Introduction Garden. Chico, Cal., 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 
Average. 
1915 
1916 
2 vears. 
1910 
and 
1911. 
7 vears, 
1910 to 
1916. 
Durum: 
Kubanka — 
2246 
2096 
1593 
1440 
2221 
1595 
1494 
19.7 
9.6 
alO. 7 
a\ 5 
2.5 
36.3 
36.6 
34.6 
29.6 
32.3 
2S.0 
23.1 
22.7 
19.1 
17.4 
26.2 
Q29.5 
Do 
Unnamed 
21.3 
25.0 
30.0 
26.3 
'32." 3* 
29.7 
34.8 
21.3 
19.0 
1S.0 
22.0 
2575 
2227 
2235-2 

Velvet Don — Velvet Don 
Kahla— 
Unnamed. 
20.0 
33.3 
'Z. 
20.1 
26.7 
Average of all durums 
11.8 
33.8 
25. 7 131.6 
23.6 
18.0 
21.1 ' 
2?. 7 
Common: 
Baart— Early Baart 
White Australian — White Aus- 
1697 39.3 
3019 2S. 
I 
90.6 
65.5 
27. 5 ' 45. 7 
&31.5 C44.7 
30.2 
&34.7 
19.2 
18.6 
27.5 
32.0 
65.0 
46.8 
40.0 
36.4 
a Average of two plats 
t> Average of six plats. 
Average of seven plats. 
All varieties are fall sown at Chico, and all are grown on summer- 
fallowed land. Xo 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 
