6oo 
Journal of Agricultural Research 
Vol. XXm, No. 8 
strong, vigorous plants in the plots planted with nearly disease-free seed 
is very marked (PI. 6), as is the decrease in percentage of nubbins, rotted 
ears, and chaffy ears. The increase in yield of marketable com is very 
significant. The relation of increased early vigor to increased yield of 
marketable com is brought out more clearly in figure 5. 
/ttfiCSA/r/P&F or/>Z/?/V 7 & 
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Table XVI .—Influence of moderately diseased and nearly disease-free seed of Funk strain 
of Reid Yellow Dent, on early vigor and yield of marketable corn, when grown on infested 
soil of medium fertility , at Bloomington , IU. t in IQ20 " 
Points considered. 
Number of plants in experiment. 
Early vigor: 
Percentage of kernels producing plants. 
Percentage of kernels producing vigorous 
plants. 
Percentage of kernels producing weak plants. 
Yield: 
Total acre yield (in bushels). 
Acre yield of marketable com (in bushels).. 
Percentage of nubbins (by count). 
Percentage of rotted ears (by count). 
Percentage of chaffy ears (by count)__ 
Moder¬ 
ately dis¬ 
eased 
com¬ 
posite. 
Nearly 
disease- 
free 
com¬ 
posite. 
323 
361 
84. 1 
91.4 
23-4 
34 * 4 
& 3 
2.6 
57*3 
61 . 7 
42.1 
54 * 7 
11. 8 
8.2 . 
4.3 
3-6 
12. 5 
2. 6 . 
In favor of disease- 
free seed. 
Increase. 
Decrease. 
Per cent. 
Per cent . 
8.6 
47 *o 
68.7 
7.6 
29.9 
30*5 
19.4 
79.2 
Table XVI gives further data on the influence of seed infection on early 
vigor and subsequent yield. Figure 6 shows graphically the data given 
in Table XVI. ' J 
