CEOP ROTATION AND CULTURAL METHODS AT AKRON, COLO. 
17 
Table 8. — Yields of barley under different cultural methods at the Akron Field 
Station for the 15 years from 1909 to 1923, inclusive 
Treatment and previous 
crop 
Plats 
aver- 
aged 
Yields per acre (bushels) 
1909 
1910 
1911 
1912 
1913 
1914 
1915 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
Aver- 
age 
Fall plowed: 
Barley _. 
1 
16.8 
10.5 
16.3 
27.9 
3.1 
36.7 
47.9 
5.0 
26.9 
1.0 
23.7 
23.4 
10.8 
7.7 
13.0 
18.0 
Spring plowed: 
Barley 
1 
1 
19.7 
22.2 
13.1 
10.2 
8.7 
2.3 
28.8 
35.2 
4.6 
7.9 
32.1 
40.2 
43.1 
50.0 
4.4 
6.5 
27.3 
32.9 
2.1 
3.1 
18.8 
18.3 
19.6 
29.3 
7.5 
7.5 
9.8 
15.8 
16.9 
20.0 
17.1 
Oats 
20.1 
Total or average... 
2 
21.0 
11.7 
5.5 
32.0 
6.3 
36.2 
46.6 
5.5 
30.1 
2.6 
18.6 
24.5 
7.5 
12.8 
18.5 
18.6 
Subsoiled: 
Barley 
1 
1 
3 
1 
19.8 
19.2 
18.7 
24.6 
6.9 
12.6 
12.9 
16.0 
5.2 
99, S 
1.5 
4.4 
6.4 
16.3 
27.9 
30.8 
42.0 
46.3 
52.3 
46.0 
60.5 
73.7 
4.2 
9.4 
16.4 
20.4 
13.5 
29.2 
23.1 
38.3 

4.4 
5.5 
11.3 
15.8 
20.4 
11.4 
33.5 
31.9 
30.1 
37.5 
41.9 
10.6 
11.7 
14.8 
34.2 
6.9 
5.0 
11.8 
24.6 
13.8 
15.1 
19.7 
29.8 
15.5 
Listed: 
Barley 
4. 6 36. 
18.6 
Disked: 
Corn.. 
1.7 
12.6 
28.9 
40.2 
20.8 
Fallowed 
30.9 
Average of all 9 
plats 
19.8 
12.0 
6.1 
30.8 
6.3 
37.8 
55.0 
11.0 
26.4 
4.3 
18.3 
32.1 
14.1 
11.7 
18.6 
20.3 
The highest yielding method was fallow, which gaye an average of 
30.9 bushels per acre for the 15 years. This average was made up of 
yields ranging from 73.7 bushels in 1915 to 11.3 bushels in 1918. The 
next highest average yield was 20.8 bushels on three plats of disked 
corn ground. 
O 4 
I i 
3 A 
?- A 
5 2 
O & 
£ & 
3 3c. 
&£ASSY/5L& 
Fig. 8.— Average yields of barley obtained under different tillage methods at the Akron Field Station 
for the 15 years from 1909 to 1923, inclusive 
One plat on spring plowing following oats in a 3-year rotation of 
corn, oats, and barley averaged 20.1 bushels per acre. 
The other four plats of barley raised that crop continuously. One 
was spring plowed, one fall plowed, one subsoiled, and one listed. 
The lowest yield was on the subsoiled plat, which averaged only 15.5 
bushels per acre. The average yields of the other three were 18 
bushels on the one plowed in the fall, 17.1 bushels on the one plowed 
in the spring, and 18.6 bushels on the one listed in the fall. 
RESULTS WITH CORN 
Corn occupied 27 plats in the experiments with rotation and cul- 
tural methods. The annual and average yields of the 13 preparations 
represented in the 27 plats are given in Table 9 and shown graphically 
in Figure 9. 
The 15-year average yield of all plats was 14.6 bushels per acre. 
This is 1,022 pounds of ear corn, or 818 pounds of shelled corn. 
The average yield of corn in pounds of grain per acre is exceeded only 
