oats, comparison is possible with two more rotations in whicli barley 
takes the place of wheat, in one case the oats following the corn and 
in the other following the barley. The yields of wheat, oats, and 
barley on corn ground and following small grains are shown in Table 7. 
Table 7. — Annual and average yields of spring wheat, oats, and barley on corn 
ground and following small grains at the Sheridan Field Station for the six years 
from 1918 to 1923, inclusive 
Crop 
Preceding crop 
Yields per acre (bushels) 
1918 
1919 
1920 
1921 
1922 
1923 
Average 
Spring wheat 
25.4 
23.4 
59.1 
55.8 
42.3 
40.5 






24.3 
23.0 
51.7 
51.3 
44.0 
43.3 
3.1 

7.7 
2.7 
3.8 
3.8 
29.3 
28.6 
45.7 
20.6 
19.6 
48 ."i 
17.1 
Do 
Small grains 
Corn 
15.8 
Oats 
.'^.'i h 
Do - 
Small grains 
Corn 
47. 9 ! 44. i 1 33.6 
Barley 
55.2 i .^fi-3 1 30.3 
Do... 
Small grains 
59.6 
25.8 
28.8 
With wheat there is a small but consistent gain in yield where the 
crop follows corn. The average gain for the 6-year period is 1.3 
bushels per acre, with a yield of 17.1 bushels on corn ground. With 
oats the yield following corn was best in four of the five years in which 
a crop was produced. The average difference in favor of corn ground 
for oats was 1.9 bushels per acre, with a yield of 35.5 bushels per acre 
on corn ground. 
With barley two plats are available for comparison, one with barley 
on disked corn ground and the other with the barley on spring plowing 
follomng oats. In three of the five years in which a crop was j^ro- 
duced the yield was in favor of the corn ground. In 1921 the yield 
was very low, but the same by both methods. For the 6-year period 
the average yield was 30.3 bushels per acre on corn ground and 28.8 
bushels following oats. 
RESULTS ON FALLOW AND FOLLOWING SMALL GRAINS 
The experiments offer a number of comparisons for study of the 
relative yields of various crops on fallow and on land in crop the 
previous year. In the continuous-cropping series two plats, C and D, 
are alternately cropped and fallowed, plat C being in crop in the even 
years and plat D in the odd years. Plats A and B are continuously 
seeded to the same crop, and for spring-seeded crops plat A is shallow 
spring plowed and plat B deep fall plowed. With winter wheat 
plat B is plowed as soon after harvest as possible and plat A shortly 
before seeding. 
Other opportunities for comparison are afforded by several rota- 
tions, in some of which the crop under consideration is on fallow 
and in others it follows a small-grain crop. The yields of the several 
crops on fallow and following small grains are shown in Table 8. 
In the best crop years there were instances where the yield following 
another grain crop was greater than on fallow, but, in general, the 
yields on fallow have been considerably more. With winter wheat 
the yields on the plat alternately fallowed averaged 23.5 bushels per 
acre for the 6-year period as compared with 15.2 bushels on the late- 
6528— 25t 2 
