22 
BULLETIN 214, U. S. DEPARTMENT OF AGRICULTURE, 
and recovered by a crop. It is probable, however, that the depth 
of feeding is not limited by any physical peculiarity of the soil and 
that the quantity of water that can be stored is large. It is reasonable 
therefore to expect that on this soil the maximum effect will be realized 
from methods of tillage calculated to store water. 
Table X. — Yields and cost of production of spring wheat by different methods at the 
Hettinger Field Station, 1912, 1913, and 1914. 
Treatment and 
previous crop. 
Num- 
ber of 
plats 
aver- 
aged. 
Yield per acre (bushels). 
Treatment and 
previous crop. 
Num- 
ber of 
plats 
aver- 
aged. 
Yield per acre (bushels). 
1912 
1913 
1914 
Aver- 
age. 
1912 
1913 
1914 
Aver- 
age. 
Fall plowed: 
Manured 
corn 
Com 
Oats 
Wheat 
1 
1 
2 
1 
9.0 
13.8 
17.8 
12.0 
18.0 
17.8 
12.7 
10.7 
11.7 
12.0 
.14.1 
6.2 
12.9 
14.5 
.14.9 
9.6 
Disked: 
Corn 
Potatoes 
Total or 
average . 
Green manured: 
Rye 
11 
1 
17.5 
11.7 
18.4 
16.7 
11.7 
11.7 
15.9 
13.4 
12 
17.0 
18.3 
11.7 
15.7 
Total or 
average . 
5 
14.1 
14.4 
11.6 
13.4 
2 
1 
1 
16.0 
18.3 
11.2 
21.3 
23.5 
8.2 
11.4 
9.0 
7.8 
16.2 
Peas 
Sweet clover 
Total or 
average. 
Summer tilled... 
Average of all 32 
plats 
16.9 
9.1 
Spring plowed: 
Com 
Oats 
Wheat 
1 
1 
13.0 
8.3 
14.3 
26.3 
16.5 
13.8 
10.3 
10.8 
10. 
16.5 
11.9 
12.7 
4 
15.4 
18.6 
9.9 
14.6 
Total or 
average. 
3 
11.9 
18.9 
10.4 
13.7 
8 
19.9 
29.6 
11.8 
20.4 
16.6 
20.6 
11.4 
16.2 
Summary of Yields and Digest of Cost. 
Tillage treatment. 
Previous crop. 
Yields, values, etc. (average 
per acre). 
Fall 
plowed 
(5 plats). 
Spring 
plowed 
(3 plats). 
Disked 
(12 
plats I. 
Green 
manured 
(4 plats). 
Summer 
tilled 
(8 plats). 
Com 
(14 
plats). 
Small 
grain 
(5 plats). 
Pota- 
toes 
(lplat). 
Yields of grain: 
1912 bushels.. 
1913 do.... 
1914 do.... 
14.1 
14.4 
11.6 
11.9 
18.9 
10.4 
17.0 
18.3 
11.7 
15.4 
18.6 
9.9 
19.9 
29.6 
11.8 
16.3 
18.6 
11.6 
14.0 
13.3 
11.0 
11.7 
16.7 
11.7 
Average 
13.4 
13.7 
15.7 
14.6 
20.4 
1.5.5 12.8 
13.4 
Crop value, cost of produc- 
tion, etc.: 
S9.38 
6.56 
S9. 59 
6.09 
S10. 99 
4.75 
S10. 22 
14.61 
$14. 28 
11.50 
Cost 
2.82 
3.50 
6.24 
-4.39 
2.78 
The results of three years at this station are available for study. 
The most striking things shown by the arrangement of yields for the 
present study are the increased production of wheat on summer 
tillage 7 on rye and peas as green manure, and on corn ground either 
disked or plowed in the spring. When yields are studied in connec- 
tion with cost of production, it is seen that, owing to good yield and 
cheap cost of preparation, the greatest profit, $6.24 per acre, has 
been obtained from wheat on disked ground. Of the disked plats, 
