14 
BULLETIN 1304, TJ. S. DEPARTMENT OF AGRICULTURE 
Table 6. — Yields of spring wheat under different cultural methods at the Akron Field 
Station for the 15 years from 1909 to 1923, inclusive 
Treatment and previous 
crop 
Plats 
aver- 
aged 
Yields per acre (bushels) 
1909 
1910 
1911 
1912 
1913 
1914 
1915 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
Aver- 
age 
Fall plowed: 
1 
19 ?. 
11.2 
5.8 
6.2 
3.4 
3.7 
2.1 
30.3 
18.8 
17.6 
1.4 
.6 
.7 
14.3 
13.6 
11.0 
31.2 
24.1 
24.0 
5.2 
3.5 
2.4 
16.5 
10.9 
13.8 
1.5 


8.0 
8.8 
6.7 
16.0 
16.2 
17.2 
1.7 
4.3 
2.2 
8.2 
5.9 
3.3 
3.7 
4.8 
3.5 
11 5 
Oats 
3 10.3 
8.8 
Wheat.. . 
12 
10.3 
8.1 
Total or average... 
6 
12.1 
6.9 
3.1 
20.3 
.8 
12.8 
25.3 
3.4 
12.8 
.3 
7.9 
16.5 
3.2 
5.4 
4.2 
9.0 
Spring plowed: 
1 
1 
1 
20.8 
14.3 
12.2 
15.3 
6.3 
11.3 
1.3 
.3 
2.9 
26.5 
20.3 
21.3 
6.8 
1.0 
4.8 
18.5 
21.2 
22.2 
30.0 
26.5 
26.3 
6.3 
1.8 
9.3 
15.7 
16.0 
19.3 
1.3 


9.0 
3.5 
7.5 
22.1 
20.4 
17.4 
1.7 
1.0 
.4.3 
6.7 
9.8 
6.7 
6.7 
9.2 
6.8 
12.6 
Oats .. 
10.1 
Wheat . 
11.5 
Total or average ... 
3 
14.9 
11.0 
1.5 
22.7 
4.2 
20.6 
27.6 
5.8 
17.0 
.4 
6.7 
20.0 
2.3 
7.7 
7.6 
11.3 
Subsoiled: 
Wheat 
1 
1 
4 
1 
1 
1 
11.2 
9.6 
15.5 
14.7 
12.0 
10.1 
5.5 
6.8 
11.4 
1.5 
1.3 
1.7 
16.0 
17.2 
19.0 
19 ?, 
.5 
2.1 
2.8 
1.5 
1.5 
3.9 
9.8 
14.2 
16.7 
15.3 
13.3 
11.2 
23.7 
23.7 
27.7 
28.7 
23.5 
26.2 
1.7 
5.5 
6.3 
10.8 
3.2 
6.3 
10.3 
12.7 
10.0 
13.8 
8.8 
20.8 



1.3 


6.0 
5.5 
4.4 
7.0 
4.3 
5.0 
15.3 
15.8 
19.5 
1.3 
1.2 
1.6 
1.8 
1.0 
1.2 
3.3 
4.7 
4.5 
6.2 
9.3 
6.0 
3.2 
3.8 
3.5 
7.3 
Listed: 
Wheat 
8.3 
Disked: 
9.6 
Green manured: 
With rye.. . 
11.7 
12.4 
3.8 
3.8 
16.4 
17.7 
20.3 
3.9 
2.8 
1.5 
10.4 
1. 8 20. 3 
8.8 
With sweet clover. . . 
1.7 
20.5 
9.2 
Total or average... 
3 
12.3 
9.3 
2.4 
20.0 
2.3 
13.3 
26.1 
6.8 
14.5 
.4 
5.4 
18.1 
1.3 
7.2 
2.7 
9.5 
Fallowed 
26 
18.4 
12.2 
8.2 
19.1 
9.1 
21.4 
30.8 
13.4 
13.9 
3.9 
6.5 
20.9 
2.1 
10.3 
8.0 
13.2 
Average of all 24 
plats 3 
13.8 
9.2 
3.7 
19.7 
3.9 
16.6 
27.3 
7.1 
13.2 
1.1 
6.3 
18.7 
2.1 
6.9 
4.6 
10.3 
1 One of these was spring plowed in 1909 and listed in 1910 and is included with those methods in those 
years. 
2 Only 2 plats in 1909, 1910, and 1923. 
a Only 20 plats in 1909, 1910, and 1923. 
Winter rye, peas, and sweet clover are each turned under as green 
manure and followed by spring wheat in 4-year rotations. The yields 
of wheat are markedly below those on fallow and little better, if any, 
than those following a harvested crop of small grain. Yields were 
heaviest following the rye and lightest following the peas. The 
differences are traceable directly to differences in the time of plowing 
the green manures under and consequent differences in the length of 
the fallow periods and the quantities of water stored in the soil. 
The average yields on the listed and the subsoiled plats do not 
differ materially from the average yield of the fall-plowed plat con- 
tinuously cropped to wheat with which they are comparable. Fol- 
lowing three crops, corn, oats, and spring wheat, the yields on spring 
plowing averaged better than those on fall plowing. The effect of 
the time of plowing on yields was considered in detail in Department 
Bulletin No. 253. 3 
RESULTS WITH OATS 
Oats are represented by 31 plats in the rotation and cultivation 
experiments. The average yield of these plats for the 15 years was 
22.4 bushels per acre. The highest yield was in 1915, when all plats 
3 Grace, O. J. The effect of different times of plowing small-grain stubble in eastern Colorado. U. S. 
Dept. Agr. Bui. 253, 15 p., illus. 1915. 
