CROP ROTATION IN RELATION TO SOIL PRODUCTIVITY 
49 
Table 50. — Comparison of relative values of rotation (R) and of the additive e 
of conjoining rotation and the use of fertilizers on limed and unlimed soils 
[Wooster, Ohio, and Florence, S. C] 
Cultural conditions 
Average 
yield 
per acre 
Values for 
.Rand F 
Additive effects 
of rotation and 
use of fertilizers 
Crop 
R 
Rela- 
tive 
value 
otR 
F 
Sum of 
increase 
effected 
by rota- 
tion and 
use of 
fertilizer 
when 
prac- 
ticed 
sepa- 
rately 
(r+f) 
Actual 
increase 
effected 
by con- 
joining 
rotation 
and use 
of ferti- 
lize rs 
Wheat (Wooster) 
Limed: 
Rotation and use of chemical 
fertilizer. 
Bushels 
32.2 
16. n 
Bushels 
11.7 
Bushels Per cent 
16. 2 72. 2 
Bushels 
22.1 
Bushels 
25.0 
fertilizer. 
Use of chemical fertilizer ; i 20. 5 
without rotation. 
Rotation and use of manure... 26.8 
Rotation without manure... ! 16. 2 
7.9 
10. 6 74. 5 
19.3 
18.9 
tion. 
Unlimed: 
Rotation and use of chemical 
fertilizer. 
Rotation without chemical 
31.7 
14. 1 
11.2 
— 
17. 6 63. 6 
20.2 
24.5 
fertilizer. 
Use of chemical fertilizer 
without rotation. 
Rotation and use of manure. 
20.5 
25.1 
14 9 
6.2 

10. 9 56. 9 17. 3 
17.2 
Use of manure without rota- j 18. 9 
tion. 
Limed: 
Rotation and use of chemical 54. 5 
fertilizer. 
Rotation without chemical i 31. 1 
fertilizer. 
Corn (Wooster).. 
20.4 
23. 4 87. 2 38. 2 
41.0 
without rotation. 
Rotation and use of manure..' 48.9 
Rotation without manure 31. 2 
Use of manure without rota- i 28. 
tion. 
Unlimed: 
Rotation and use of chemical 48. 9 
fertilizer. 
20.9 
17. 7 118. 1 40. 4 
39.5 
14.8 
22. 67. 3 34. 
35.4 
fertilizer. 
Use of chemical fertilizer 
without rotation. 
Rotation and use of manure- 
Rotation without manure . . . 
Use of manure without rota- 
tion. 
Limed: 
Rotation and use of chemical 
fertilizer. 
Rotation without chemical 
fertilizer. 
Use of chemical fertilizer 
without rotation. 
Rotation and use of manure. 
34.1 
44.2 
27.0 
28.0 
53.2 
35.1 
137.9 
44.0 
35.6 
16.2 
17. 2 | 94. 2 
36.2 
34.8 
Oats (Wooster).. 
15.3 
! 
18. 1 84. 5 35. 6 
' 
34.5 
" 1 
15.6 
8. 4 185. 7 1 25. 4 
24.7 
1 28.4 
tion. 
Unlimed: 
Rotation and use-of chemical 52. 8 
fertilizer. 
14.9 
20.5 72.7 
I 
32.8 
34.1 
1 Yields are for unlimed plots in continuous culture. 
