TIME OF PLOWING SMALL-GBAIN STUBBLE. 5 
leaves the surface somewhat rough and tends to pack the furrow slice 
down on weeds or trash plowed under. The spring plowing for small 
grains has been done as early as weather conditions would permit and 
packed in the same manner as the fall plowing. Plowing for corn has 
been deferred until planting time. 
Table II presents the results with spring wheat on fall-plowed and 
spring-plowed oat stubble in two similar 3-year rotations, Nos. 4 
and 9, and from both the fall and the spring plowing of land con- 
tinuously cropped to wheat. In this latter comparison the fall plow- 
ing is deeper than the spring plowing, but this difference has not 
apparently affected the results sufficiently to prevent their com- 
parison in a study of the effects of time of plowing. 
Table II. — Annual and average yields of spring wheat from fall-plowed and spring- 
plowed plats at the Akron Field Station, 1909 to 1914, inclusive. 
Rota- 
tion 
No. 
Yield per acre of grain (bushels). 
Treatment. 
1909 
1910 
1911 
1912 
1913 
1914 
Aver- 
age. 
Fall plowed: 
Oat stubble 
4 
B 
10.6 
10.3 
4.6 
6.2 
6.7 
4.1 
18.8 
20.7 
0.3 
.8 
13.8 
12.2 
9.1 
9.1 
10.5 
5.4 
5.4 
19.8 
.6 
13.0 
9.1 
9 
A 
Spring plowed: 
Oat stubble 
14.3 
14.3 
6.3 
11.3 
.2 
2.9 
20.3 
21.3 
1.0 
4.8 
21.2 
22.2 
10.6 
Wheat stubble 
12.8 
14.3 
3.8 
8.8 
3.4 
1.6 
-3.8 
20.8 
1.0 
2.9 
2.3 
21.7 
8.7 
11.7 
Gain or loss of spring-plowed 
2.6 
Table III presents in similar form the yields of oats from fall-plowed 
wheat stubble in rotations Nos. 1 and 3, from spring-plowed wheat 
stubble in rotation No. 2, and from both the fall and the spring 
plowing of land continuously cropped to oats. 
Table III. — Annual and average yields of oats from fall-plowed and spring-plowed 
plats at the Akron Field Station, 1909 to 1914, inclusive. 
Treatment. 
Rota- 
tion 
No. 
Yield per acre of grain (bushels). 
1909 
1910 
1911 
1912 
1913 
1914 
Average. 
Fall ploweo*. 
1 
3 
B 
25.6 
15.6 
14.1 
15.9 
13.0 
8.0 
13.6 
14.8 
15.9 
56.8 
40.0 
46.9 
7.2 
4.7 
.6 
35.9 
36.6 
36.9 
25 8 
Do 
20.8 
20.4 
Average for fall-plowed plats 
18.4 
12.3 
14.8 
47.9 
4.2 
36.5 
22.4 
2 
A 
Spring plowed: 
Wheat stubble 
18.3 
21.1 
14.8 
10.9 
1.7 
4.3 
46.9 
41.9 
16.6 
6.6 
47.5 
39.4 
24.3 
Oat stubble 
20.7 
Average for spring-plowed plats. 
Gain or loss of spring-plowed 
over fall-plowed plats 
19.7 
1.3 
12.9 
.6 
3.0 
-11.8 
44.4 
-3.5 
11.6 
7.4 
43.4 
6.9 
22.5 
.1 
