22 
BULLETIN 1377, U. S. DEPARTMENT OF AGRICULTURE 
THREE-YEAR ROTATION AND CONTINUOUS CULTURE 
Table 15. — Comparable yields of corn and wheat in the 8-year rotation and in 
continuous culture, Missouri 
[Yields in bushels per acre] 
Corn 
Year 
Wheat 
Year 
3-year rotation 
(corn, wheat, 
clover) 
Continuous 
culture 
3-year rotation 
(corn, wheat, 
clover) 
Continuous 
culture 
No fer- 
tilizer, 
plot 27 
Farm 
ma- 
nure, 
plot 28 
No fer- 
tilizer, 
plot 17 
Farm 
ma- 
nure, 
plot 18 
No fer- 
tilizer, 
plot 27 
Farm 
ma- 
nure, 
plot 28 
No fer- 
tilizer, 
plot 9 
Farm 
ma- 
nure, 
aver- 
age of 
6 plots i 
1890 
28.4 
45.8 
41.1 
24.9 
21.0 
19.4 
38.0 
11.9 
11.7 
1.9 
7.0 
7.4 
60.7 
34.0 
46.4 
31.9 
79.4 
64.3 
33.4 
6.5 
19.2 
14.6 
1889 
14.9 
18.4 
8.2 
6.2 
22.0 
2.7 
15.6 
16.0 
1893 
24. 3 34. 6 
34. 9 51. 4 
25. 5 37. 9 
1892 
9. 2 24. 2 
27.5 42.3 
5.0 15.7 
23.3 1 34.5 
19.3 
1896... 
1895 
38.6 
1899. .. 
1898 
6.0 
1902. . 
65.3 
50.7 
47.2 
16.6 
13.9 
19.6 
88.6 
77.6 
65.9 
32.7 
24.7 
1901 
25.3 
1905 
1904 
1907 
1908... 
6.9 29.2 
11. 5 33. 6 
18.1 
13.5 
7.1 
5.0 
20.1 
0.2 
19.1 
1910--. 
1911 
19.1 
1913... 
1914 
26.4 
1916 
1917 
10.9 
Average 
Average 
32.6 
51.0 
18.4 
39.0 
14.4 | 28.3 
9. 7 20. 1 
Average of plots 5, 10, 21, 24, 30, and 36, continuous culture. 
TWO-YEAR ROTATION AND CONTINUOUS CULTURE 
Table 16. — Comparable yields of wheat in the 2-year rotation and in continuous 
culture, Missouri 
[Yields in bushels per acre] 
2-year rotation 
(wheat and 
clover) 
Continuous culture 
Year 
No fer- 
tilizer, 
plot 33 
Farm 
ma- 
nure, 
plot 31 
No fer- 
tilizer, 
plot 9 
Farm manure 
Plot 5 
Plot 10 
Plot 21 Plot 24 
Plot 30 
Plot 36 
Aver- 
age or 
sum- 
mary 
889 
23.7 
33.3 
21.3 
31 4 
8.2 
24.6 
8.1 
27.2 
15.0 
31.3 
11.8 17.0 
30. 8 30. 6 
20.9 
31.9 
23.0 
27.3 
4.0 
33.0 
14.7 
18.2 
27.2 
"""24.T 
21.9 
20.3 
20.9 
16.0 
891 
29.9 
g93 
8. 3 9. 3 
■M. 7 43. 3 
4.0 
8 95 
22.0 
1.7 
2.7 
15.6 
11.5 
34.3 
13.8 
13.6 
23.3 
17.3 
12.4 
17.1 
40.7 
6.1 
15.8 
25.2 
16.0 
15.4 
10.8 
15.2 
10.3 
16.9 
18.7 
10.9 
43. 3 39. 2 
8. 4 8. 2 
15.8 12.0 
24. 1 23. 6 
6. 8 7. 5 
15. 6 15. 6 
24. 1 23. 1 
11.7 13.8 
30. 6 28. 6 
17. 4 17. 3 
41.3 
14.8 
15.7 
28.5 
7.4 
29.7 
11.4 
10.4 
18.4 
22.5 
38.6 
L ^97 
8 99 
12.5 
2.7 
30.9 
30.3 
14.8 
38.2 
11.0 
, 15.2 
01 
25.3 
03 
11.0 
05 
10.0 
12.8 
14.3 
16.9 
25.7 
11.7 
11.1 
24.2 
12.1 
32.6 
27.8 
25 1 
17.7 
07 
18.6 
19 09 
14.6 
19 11 
5.0 
8.8 
2.0 
0.2 
6.5 
15.9 
19.1 
19 13 
18.5 
19 15 
18.7 
1 17 
20.7 
10.9 

Average 
18.4 
24.9 
9.1 
17.9 
1 
Inasmuch as the efficiencies of the four Missouri rotations, as 
determined by comparing the average yields of the crops in common, 
are not comparable, because of the fact that the average yields of 
