18 
BULLETIN 214, U. S. DEPARTMENT OF AGRICULTURE. 
realize a maximum benefit from the water previously stored in the 
soil by some methods. The crop of 1914 was damaged at least 25 
per cent by hail shortly before harvest. 
Table VIII. — Yields and cost of production of spring wheat by different methods at the 
Dickinson Field Station, 1908 to 1914, inclusive. 
Treatment and 
Number 
of plats 
averaged. 
Yield per acre (bushels). 
> 
previous crop. 
1908 
1909 
1910 
1911 
1912 
1913 
1914 
Average. 
Fall plowed: 
Corn 
1 
1 
2 
1 
35.0 
33.8 
19.7 
17.7 
37.3 
40.7 
34.7 
25.2 
24.0 
22.5 
19.2 
18.2 
4.7 
3.2 
.7 
1.4 
H 
H 
H 
H 
H 
H 
H 
H 
H 
H 
H 
27.5 
27.5 
26.8 
20.5 
15.9 
13.2 
11.3 
8.9 
24.1 
Manured corn 
Oats 
23.5 
18.7 
Wheat 
15.3 
Total or average... 
5 
25.2 
34.5 
20.6 
2.1 
25.8 
12.1 
20.1 
Spring plowed: 
Corn 
1 
1 
1 
35.0 
18.7 
24.3 
39.7 
30.7 
26.8 
27.8 
18.1 
17.4 
14.0 
1.3 
5.7 
28.0 
17.0 
13.5 
12.0 
15.2 
10.5 
26.1 
Oats 
16.8 
Wheat 
16.4 
Total or average... 
3 
26.0 
32.4 
21.1 
7.0 
19.5 
12.6 
19.8 
Disked: Corn 
9 
32.3 
37.9 
22.7 
3.8 
27.8 
15.3 
23.3 
Green manured: 
Rye 
2 
2 
1 
32.1 
30.0 
31.0 
38.3 
36.0 
32.3 
19.7 
17.4 
19.0 
5.6 
1.2 
1.3 
28.0 
24.8 
24.5 
20.0 
18.6 
13.7 
24.0 
Peas 
21.3 
20.3 
Total or average... 
5 
31.0 
36.1 
18.6 
3.0 
26.0 
18.2 
22.2 
Summer tilled 
3 
33.6 
36.9 
26.0 
22.1 
27.2 
19.2 
27.5 
Average of all 25 plats . 
30.0 
36.1 
21.7 
5.9 
25.9 
15.4 
22.5 
Summary of Yields and Digest of Cost. 
Yields, values, etc. 
per acre). 
Yields of grain: 
1908 
1909 
bushels.. 
do.... 
1910 
do.... 
1911... 
do... 
1912 
do.... 
1913... 
do... 
1914 
do.... 
Crop value, cost of production, 
etc.: 
Value 
Cost 
Profit 
Tillage treatment. 
Fall 
plowed 
(5 plats). 
25.2 
34.5 
20.6 
2.1 
H 
25.8 
12.1 
20.1 
S14.07 
6.56 
Spring 
plowed 
(3 plats). 
26.0 
32.4 
21.1 
7.0 
H 
19.5 
12.6 
19.8 
S13.86 
6.09 
Disked 
(9 plats). 
32.3 
37.9 
22.7 
3.8 
H 
27.8 
15.3 
23.3 
S16. 31 
4.75 
Green 
manured 
(5 plats). 
31.0 
36.1 
18.6 
3.0 
H 
26.0 
18.2 
22.2 
SI 5. 54 
14.01 
Summer 
tilled 
(3 plats). 
33.6 
36.9 
26.0 
22.1 
H 
27.2 
19.2 
27.5 
$19.25 
11.50 
7.75 
Previous crop. 
Corn 
(12 plats). 
33.0 
38.3 
23.2 
4.9 
H 
27.8 
14.9 
23.7 
Small 
grain 
(5 plats). 
20.0 
30.4 
18.4 
2.0 
[ 
20.9 
11.4 
17.2 
1 H= Destroyed by hail. 
Some indications shown in Table VIII are rather striking. The 
effect of the preceding crop and the preparation for spring wheat 
divide rather sharply into two groups, as indicated by the results 
obtained. When wheat followed summer tillage, corn, or green 
manure it has given comparatively high yields. When it followed 
