CROP ROTATION AND CULTURAL METHODS AT AKRON, COLO. H 
follows wheat, and 5.6 bushels more than wheat on disked corn ground. 
In this bulletin the yields on fallow and the yields on green manure, 
which is a modified fallow, are given for the area actually in crop. 
The use of this area is required for two years to produce the one crop. 
In any one year an area equal to the cropped area produces nothing. 
Table 5. — Yields of winter wheat under different cultural methods at the Akron 
Field Station for the 15 years from 1909 to 1923, inclusive 
Treatment and pre- 
vious crop 
Plats 
Yields per acre (bushels) 
aver- 
aged 
U909 
1910 
1911 
19121913 
1914 
1915 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
Aver 
age 
Late fall plowed: 
Winter wheat 
Early fall plowed: 
Winter wheat. 
Subsoiled: 
Winter wheat 
Listed: 
Winter wheat 
Disked: 
Corn 
1 
1 
1 
1 
3 
14.5 
12.9 
13.3 
12.2 
14.0 
11.4 
10.3 
6.9 
8.8 
17 7 
1.7 
6.8 
3.3 
4.0 
3.1 
25.8 3.324.5 
26.7 2.0 24.8 
21.2 3.2 24.5 
30.0 7.2 21.3 
36.3 11.4 27.7 
22.0 
20.8 
21.0 
18.2 
?fi ? 
4.2 
4.2 
3.8 
7.7 
15.3 
2.7 
5.0 
5.7 
3.8 
5.9 
2.0 
1.5 
1.2 
3.0 
5.2 
7.6 
20.3 
12.5 
14.2 
13.1 
13.8 
13.5 
15.0 
11.7 
14.9 
3.0 
7.0 
5.8 
9.0 
6.5 




1 3 
0.3 
1.5 
1.2 

3.2 
9.1 
10.5 
9.2 
10.1 
13.5 
. . i 
!. 1 
Green manured: 
With rye 
4 
13. 9 15. 7 
3.7 
2.4 
36. 8 8. 4'27. 2'25. 2 
19.7 
9.7 
6.4 
6.6 
8.2 
2.1 
14.5 
12.8 
11.7 
14.2 
16.6 
10.9 
1.3 

3.1 
2.3 
14.2 
With peas 
4| 13.3 12.7 
33. 2 4. 2 23. 1 
13.8 
10.8 
Total or average. . 
8 13.6 14.2 
3.1 
35.0 
6.3 25.1 
19.5 
14.7 
6.5 
5.2 
13.7 
13.0 
13.8 
.7 
2.7 
12.5 
Fallowed 
2 
17.918.0 10.fi 
40. 9 12. 7J27. o!27. 4 
24.9 
13.7 
13.2 
6.6 
12.9 
5.3 
26.3 
15.0 
19.3 
14.2 
27.5 
12.3 
.9 7.4 
19.1 
• Average of all 17 
plats 
*, 
« 
4.1 
33.8 
7. 4 25. 5 
21.8 
.6 
, 9 
12.8 
1 Winterkilled and reseeded to spring wheat. 
The yield on disked corn ground is the average of three plats in as 
many 4-year rotations. The 15-year average yield of this method is 
13.5 bushels per acre. This is 3 bushels per acre more than the best 
method following wheat and 5.6 bushels less than on fallow. When 
winter wheat is grown on fallow 2 acres are required to produce 19.1 
bushels. When it is grown on corn ground the 2 acres produce 13.5 
bushels of w r heat and about 14 bushels of corn. In addition to the 
grain there is also the corn stover. Where the corn can be properly 
utilized, the disked ground appeals as the most profitable prepara- 
tion for winter wheat. 
The yields following rye as green manure and peas as green manure 
are each the averages of four plats in separate 4-year rotations. The 
production on land green manured with peas was but little better 
than on that producing a crop of wheat each year. The production 
on land green manured with rye averaged only a fraction of a bushel 
more than on disked corn ground. Green manuring thus seems 
to be of no economic value for this section. Green manure, like fal- 
low, requires the use of the land for two years to produce one crop. 
The relatively poor results from the use of peas may be explained by 
the fact that they are flowed under at a late date, and the oppor- 
tunity for storing water in the soil is but little greater than it is where 
a crop is harvested. Rye is plowed under considerably earlier, and 
the results following it approach more nearly to those on fallow. 
The several methods of preparation by which winter wheat is grown 
continuously group themselves with no great differences among 
them but in sharp contrast to fallow and corn ground. The rela- 
