22 
BULLETIN 222, U. S. DEPARTMENT OF AGRICULTURE. 
The one plat on disked-corn ground has been low in yield, its 
average being below that of barley following small grain. There is 
some evidence to support the belief that the location of the rotation 
containing this plat is such that it is normally a little lower in yield 
than the rest of the field. 
The only method under trial that exhibits power to rnarkedly 
increase the yield over other methods is summer tillage. This power 
has not been manifested every year, but in some years it has been very 
marked. The average yield for eight years by this method has been 
26.7 bushels per acre as against 16.3 bushels where the crop followed 
small grain. This increase in yield has been just about equal to the 
increased cost of growing the crop under this method. All methods 
show either a profit or a loss of less than $1 per acre. 
Table XIII. 
Yields and cost of production of barley by different methods at the North 
Platte Field Station, 1907 to 1914, inclusive. 
Treatment and previous crop. 
Number 
of plats 
averaged. 
Yield 
per acre (bushels). 
1907 
1908 
1909 
1910 
1911 
1912 
1913 
1914 
Average. 
1 
40.0 
43.3 
10.4 
12.5 

14.6 
5.0 
11.0 
17.1 
Spring plowed: 
1 
1 
39.0 
40.2 
19.6 
22.3 
21.5 
18.6 
13.8 
16.0 


20.8 
20.0 
6.5 
6.3 
5.3 
3.6 
15.8 
Oats 
15.9 
Total or average 
2 
39.6 
21.0 
20.1 
14.9 
20.4 
6.4 
4.5 
15.9 
Disked: Corn 
1 
30.6 
39.0 
24.9 
67.7 
21.5 
23.8 
7.9 
26.0 


12.3 
20.0 
5.0 
16.5 
5.2 
20.8 
13.4 
26.7 

Average of all 5 plats 
37.8 
35.6 
19.2 
15.2 
17.5 
7.9 
9.2 
17.8 
Summary of Yields and Digest of Cost. 
Tillage treatment. 
Previous crop. 
Yields, values, etc. (average per acre). 
Fall- 
plowed 
(1 plat). 
Spring- 
plowed 
(2 plats). 
Disked 
(1 plat). 
Summer- 
tilled 
(1 plat). 
Small 
grain 
(3 plats). 
Corn 
(1 plat). 
Yields of grain: 
1907 bushels. . 
1908 do.... 
1909 do.... 
1910 do.... 
1911 do.... 
1912 do.... 
1913 do.... 
1914 do.... 
40.0 
43.3 
10.4 
12.5 

14.6 
5.0 
11.0 
39.6 
21.0 
20.1 
14.9 

20.4 
6.4 
4.5 
30.6 
24.9 
21.5 
7.9 

12.3 
5.0 
5.2 
39.0 
67.7 
23.8 
26.0 

20.0 
16.5 
20.8 
39.7 
28.4 
16.8 
14.1 

18.5 
5.9 
6.6 
30.6 
24.9 
21.5 
7.9 

12.3 
5.0 
5.2 
Average 
17.1 
15.9 
13.4 
26.7 
16.3 
13.4 
Crop value, cost of production, etc.: 
$7.01 
6.46 
$6.52 
5.99 
$5.49 
4.65 
$10.95 
11.40 
Cost 
.55 
.53 
.84 
- .55 
