16 
BULLETIN 214, U. S. DEPARTMENT OF AGRICULTURE. 
yields, while in 1910 and 1911 nearly all yields were so low as to be 
practical failures. With this wide diversity in seasons and yields, 
the results from year to year have been fairly consistent, the most 
serious departure being the low yield on disked corn ground in 1914. 
Minor differences, it is true, have been manifested, particularly as to 
the relative merits of fall and spring plowing, but on the whole there 
is a remarkable uniformity. 
Table VII. — Yields and cost of production of spring wheat by different methods at the 
Williston Field Station, 1910 to 1914, inclusive. 
Treatment and previous crop. 
Number 
of plats 
averaged. 
Yield per acre (bushels). 
1910 
1911 
1912 
1913 
1914 
Average. 
Fall plowed: 
Corn 
1 
2 
1 
0.7 
.9 
1.3 
1.8 
1.7 
2.3 
36.5 
35.1 
33.8 
16.1 
9.5 
11.7 
23.3 
31.0 
22.5 
15.7 
Oats 
15.6 
Wheat 
14.3 
4 
.9 
1.9 
35.1 
11.7 
26.9 
15.3 
Spring plowed: 
Corn 
Oats 
1 
1 
.7 
1.8 
1.7 
5.5 
4.0 
2.7 
38.2 
32.2 
25.2 
14.4 
13.0 
16.8 
26.8 
31.5 
23.8 
17.1 
16.5 
Wheat 
14.0 
3 
1.4 
4.1 
31.9 
14.7 
27.4 
15.9 
Disked : Corn 
7 
.9 
5.8 
39.7 
15.3 
19.5 
16.2 
Green manured: 
Rye 
1 
1 
2.8 
2.0 
.8 
2.5 
36.0 
33.0 
18.8 
19.7 
37.3 
32.7 
19.1 
18.0 
2 
2.4 
1.7 
34.5 
19.3 
35.0 
18.6 
3 
4.9 
8.2 
39.9 
17.8 
30.3 
20.2 
1.8 
4.6 
37.0 
15.2 
25.7 
16.9 
Summary of Yields and Digest of Cost. 
Tillage treatment. 
Previous crop. 
Yields, values, etc. (average 
per acre). 
Fall 
plowed 
(4 plats). 
Spring 
plowed 
(3 plats). 
Disked 
(7 plats). 
Green 
manured 
(2 plats). 
Summer 
tilled 
(3 plats). 
Corn 
(9 plats). 
Small 
grain 
(5 plats). 
Yields of grain: 
1910 bushels. . 
1911 do.... 
1912 do.... 
1913 do.... 
1914 do.... 
0.9 
1.9 
35.1 
11.7 
26.9 
1.4 
4.1 
31.9 
14.7 
27.4 
0.9 
5.8 
39.7 
15.3 
19.5 
2.4 
1.7 
34.5 
19.3 
35.0 
4.9 
8.2 
39.9 
17.8 
30.3 
0.9 
5.3 
39.2 
15.3 
20.8 
1.3 
2.5 
32.3 
12.1 
27.9 
15.3 
15.9 
16.2 
18.6 
20.2 
16.3 
15 2 
Crop value, cost of production,, 
etc.: 
S10. 71 
6.56 
811.13 
6.09 
S11.34 
4.75 
S13.02 
14.61 
$14.14 
11.50 
Cost 
4.15 
5.04 
6.59 
- 1.59 
2.64 
The highest average yield, 20.2 bushels per acre, has been obtained 
from summer tillage. The plowing under of rye or peas for green 
manure has resulted in the next highest average yield. Spring rye 
