10 
BULLETIN 1306, U. S. DEPARTMENT OF AGEICULTURE 
plowed plat and 14.2 bushels on the early-plowed one, showing 
increases of 8.3 and 9.3 bushels in favor of fallow. In the rotations 
with which comparisons may be made, the average yield on fallow 
was 27.7 bushels per acre, as compared with 16.8 bushels following a 
grain crop, an increase of 10.9 bushels for the fallow. 
With spring wheat the average yield on the alternate fallow was 
20.3 bushels. This is 7.8 bushels more than the yield from spring 
plowing continuously cropped and 6.4 bushels more than from faU 
plomng. In rotations the yield following fallow averaged 23 bushels 
per acre, or 7.7 bushels more than following small grain. 
Table 8. — Yields of winter wheat, spring wheat, oats, and barley following small 
grains and fallow at the Sheridan Field Station for the six years from 1918 to 
1923, inclusive 
Crop 
Preceding crop 
Treatment 
Yields per acre (bushels) 
1918 
1919 
1920 
1921 
1922 
1923 
Average 
Winter wheat. 
Do 
Winter wheat „. 
do 
Late plowed 
Early plowed 
Alternate fallow 
Fallow in rotation... 
35.4 
33.8 
44.2 
38.0 
32.6 
21.1 
23.1 
29.2 
30.3 
21.6 
50.6 
53.1 
61.2 
58.9 
57.2 
55.8 
28.6 
26.4 
47.9 


9.9 
7.2 



3.3 
5.0 



2.2 
2.8 




21.3 
20.5 
30.0 
32.0 
25.4 
16.2 
20.5 
23.3 
23.7 
24.3 
48.8 
51.9 
55.3 
58.4 
60.3 
51.3 
31.3 
.39.4 
3.0 
2.3 
14.0 
23.8 
2.7 
1.0 

7.0 
20.5 
1.5 
3.4 

14.7 
25.3 
3.1 
2.7 
2.5 

13.5 
24.3 
21.2 
20.8 
38.8 
29.6 
22.7 
24.5 
34.2 
34.0 
29.5 
38.4 
42.5 
50.6 
39.1 
61.6 
47.9 
29.2 
36.9 
36.9 
7.2 
7.3 
22.3 
26.5 
10.4 
13.7 
15.2 
24.8 
24.2 
14.8 
38.8 
44.4 
65.6 
66.3 
48.1 
44,1 
19.8 
23.8 
34.4 
15.? 
14.2 
Do 
Fallow 
23.5 
Do . 
... do 
27.7 
Do 
Small grains 
16 8 
Spring wheat 
Do ., .. 
Spring wheat-... 
do 
Spring pi owed. 
Fall plowed 
12.5 
13.9 
Do 
Fallow 
Alternate fallow 
Fallow in rotation... 
20 3 
Do 
Do . . 
do.. 
Small grains . . 
23.0 
15.3 
Oats.. 
Oats 
Spring pi owed 
Fall plowed 
30.0 
Do 
do 
Fallow 
32.0 
Do. 
Alternate fallow 
Fallow in rotation... 
Wheat on fallow 
41.6 
Do 
Do 
do 
Wheat 
41.8 
38.4 
Do 
Small grains 
33.6 
Barley 
Barley 
Spring plowed 
Fall plowed 
18.6 
Do 
do 
21.1 
Do 
Fallow 
Alternate fallow 
4.2 j 42.9 
30.0 
Oats have shown about the same increase in yields on fallow as 
spring wheat. In the continuous-cropping series the average yield 
on fallow was 41.6 bushels per acre, an increase of 11.6 bushels over 
spring plowing and 9.6 bushels over fall plowing. In rotations that 
were comparable the increased yield due to fallow was slightly less. 
The vield on fallow was about the same, but the production following 
small grains was slightly higher than in the continuous-cropping 
series. The increased yield of oats on fall plo^ving after wheat on 
fallow over the yield following small grains in other rotations is of 
interest in this connection. This increa.se amounted to nearly 
5 bushels per acre, apparently owing to a carry-over effect from the 
fallow preceding the wheat crop. Where the rotation was reversed, 
with oats on fallow and wheat following oats, no such effect was 
noticeable. This condition is in line with the results obtained at 
other stations having similar tests. 
With barley the only comparison possible is with alternate fallow 
and continuous cropping. The average yields for the 6-year period 
were 18.6 bushels on spring plowing, 21.1 bushels on fall plowing, 
and 30 bushels on fallow, an increase of about half on fallow. 
RESULTS ON FALLOW AND ON CORN GROUND 
The average yield of winter wheat in rotations where fallow may 
be compared with corn groimd was 31.1 bushels on fallow and 20.5 
