15 
yield of oats following wheat in the sorgo rotation was 31.6 bushels, 
as compared with 33.6 bushels following small grains in other rota- 
tions, a difference of 2 bushels per acre. 
Results are available for only the last three years for the other 
rotation in which oats follow sorgo. During tliis time the average 
yield was 35 bushels per acre, as compared with 34.1 bushels following 
corn in rotation 4. The yield following sorgo was highest in two of 
the three years. In this rotation wheat follows the oats, and its 
yield was about the same as that following oats in other rotations. 
It appears then that with wheat there may be a slightly depressing 
effect from the sorgo on the succeeding crop. With the short record 
available for oats following sorgo this effect does not appear. 
VARIETAL EXPERIMENTS 
Experiments are conducted to determine the varieties of field crops 
best adapted to this section and to learn the best time and rate of 
seeding. The work was outlined and the original seed supplied by 
the Office of Cereal Investigations, Bureau of Plant Industry, United 
States Department of Agriculture. That office also contributed to 
the expense of the work from 1917 to 1920, inclusive. Varietal trials 
are conducted with winter wheat, spring wheat, oats, barley, and 
corn. Flax was included from 1917 to 1920, but was discontinued 
after that time. The number of varieties of each crop necessarily 
has been limited, and generally only those have been included that 
were considered best adapted to this section, were already being 
grown here, or were representative of types thought to be adapted. 
Previous to 1921 the varietal experiments were conducted on plats 
one-twentieth of an acre in size, while the experiments with rates and 
dates of seeding were on fortieth-acre plats. Beginning with 1921 all 
experiments were conducted on the smaller plats. Throughout the 
entire period each variety was grown on three systematically repli- 
cated plats in order to guard against differences due to soil variation. 
Table 11. — Annual and average yields of winter -wheat varieties at the Sheridan 
Field Station for the seven years from 1917 to 1923, inclusive 
C.I. 
No.i 
Yields per acre (bushels) 
Variety 
1917 
1918 
1919 
1920 
1921 
1922 
I 
1 
1923 
Average 
1917 to i 
1923 ! 
1918 to 
1923 
Kharkof 
Turkey 
1442 
1571 
5146 
1559 
1438 
1543 
3330 
9.3 
9.2 
"8."i" 
6.6 
7.5 
6.1 
44.4 
42.8 
43.3 
44.5 
44.1 
42.4 
42.2 
17.2 
11.4 
11.9 
13.9 
9.6 
8.9 
10.3 
38.4 
34.7 
32.0 
36.3 
33.3 
32.0 
30.9 
22.1 
18.2 
22.1 
21.9 
15.3 
18.0 
11.9 
28.5 
29.1 
26.0 
27.8 
30.5 
26.0 
14.7 
20.9 
23.3 
16.7 . 
23.8 
21.6 ' 
21.8 ' 
4.0 
25.8 
24.1 
28.6 
26.6 
Kanred 
25.3 
Crimean 
Alton 
Beloglina. .. 
25.2 
23.0 
22.4 
17.2 
28.0 
25.7 
24.9 
Buffum Xo. 17 
19.0 
Cereal Investigations serial number. 
WINTER WHEAT 
Seven varieties of winter wheat were grown. Table 11 shows the 
annual yield of each variety and the averages for the two periods from 
1917 to 1923 and from 1918 to 1923, inclusive. Kanred was not 
