Mar. is, 1924 Wheat Scab, Corn Rootrot, and Crop Successions 873 
Table VI. —Data showing field stands and acre yields from disease-resistant and disease- 
susceptible strains of Yellow Dent corn, both grown on fields previously cropped to 
clover and scabbed wheat, respectively, at Bloomington, III., in 1920 —Continued 
PREVIOUS CROP—SCABBED WHEAT 
Plat No. 
Resistant seed. 
i 
! 
| 
i Plat No. 
| 
Susceptible seed. 
Field stand. 
Acre 
yield. 
Field stand. 
Acre 
yield. 
Number 
of stalks. 
1 
Per cent. 
Number 
of stalks. 
Per cent. 
Bushels , 
Bushels . 
A I. 
39 
81. 3 
65.6 
B 1. 
34 
70. 8 
54-5 
O 
A 2. 
45 
93-8 
73 - S 
B 2. 
37 
77. I 
49 - 5 
A3. 
46 
95-8 
8l. 4 
B 3. 
37 
77. I 
43-6 
A 4. 
4 i 
85*4 
77.O 
B 4. 
34 
70. 8 
55 * 1 
A3. 
38 
79 . 2 
76. 2 
34 
70. 8 
61. 0 
A 6. 
43 
89.6 
80. I 
B 6. 
44 
91.7 
66.5 
Average. . 
42. 0 
87-5 
75 - 6 
Average.. 
36.7 
76. 4 
55 -o 
Ci. 
42 
87.5 
67.6 
D 1. 
40 
83-3 
%9 
C 2. 
44 
91. 7 
56. O 
D 2. 
38 
79.2 
62. 0 
C 3.... 
39 
81. 3 
68. 7 
D 3 . 
42 
87-5 
45 - 1 
0 
C 4. 
38 
79.2 
73 -o 
D 4. 
44 
01 . 7 
5°* 8 
O 
C 3 . 
4 i 
8v 4 
74 - 5 
D 3 . 
37 
77. 1 
59-4 
J *r 
C 6. 
43 
89.6 
69.8 
D 6. 
39 
8l. 3 
53-2 
Average.. 
41. 2 
85.8 
68.3 
Average.. 
40. 0 
83-3 
55-7 
Ei. 
42 
87. 3 
76.8 
F 1. 
36 
75 -o 
47.6 
E 2. 
! 46 
95-8 
73-3 
F 2 . 
4 i 
85- 4 
51.8 
E 3. 
45 
93-8 
74 . 7 
F 3 . 
45 
93-8 
55 -1 
e 4 . 
40 
83-3 
66.8 
F 4 . 
43 
89.6 
5 °- 4 
Es. 
47 
97-9 
74.4 
F 5 . 
43 
89. 6 
52. 2 
E 6 . 
42 
87- 5 
69. 1 
F 6 . 
39 
81.3 
58. 2 
Average.. 
43 - 7 
¥ 
91. O 
72. 5 
Average.. 
41. 2 
85.8 | 
52. 6 
General 
General 
average. 
4 2 * 3 
88. 1 
72. 1 
average. 
* 39 - 3 
8l.8 1 
54-4 
Table VII. —Summary of data given in Table VI on the relation of previous cropping 
to the yield of corn grown from disease-resistant and disease-susceptible seed at Bloom¬ 
ington, III., in 1920 
Previous crop. 
Acre yield of 
corn grown 
from disease- 
resistant seed. 
Acre yield of 
com grown from 
disease-sus¬ 
ceptible seed. 
Bushels. 
Bushels. 
Clover (relatively clean soil) 
Scabby wheat (infested soil) 
' 83. 7±0.8 72. 9±o. 8 
I 72. 1 ±0.9 54. 4±i. 1 
11. 6±i. 2 
18. 5 ±i. 4 
Difference 
