INFLUENCE OF SPACING ON PRODUCTIVITY OF CORN. 
Table 6. — Ratio of totol yields of single-ear and prolific types of corn at each of four 
spacings on a basis of 100 for the single-ear type and relative yields within each type on 
a basis of 100 for the closest spacing, all years and at all stations. 
Spacing. 
Stand 
(number 
of plants) 
per acre. 
First 11,820 
Second 8, 523 
Third 6,034 
Fourth 3, 098 
Ratio of yields. 
Relative yields 
within each type. 
Single 
ear. 
100 
100 
100 
100 
Prolific. 
110 
113 
132 
129 
Single 
100 
80 
68 
Prolific. 
100 
90 
96 
The larger yields of the prolific type indicate its better adjustment 
to variations in stand. Both types gave their maximum yields at 
the closest spacings. As the spacing increases, the yields of the 
single-ear type decrease more rapidly than those of the prolific and 
reach a considerably lower minimum. 
The extreme variation in ear weight and in the number of ears 
per plant of both types for the nine experiments is shown in Table 7. 
Table 7. — Extreme variation in weight of ear and in number of ears per plant in single- 
ear and prolific types of corn on a basis of 100 for each of the minima. 
Type. 
Weight of ear. 
Number of ears per 
plant. 
Minimum. Maximum. 
Minimum. 
Maximum . 
100 289 
100 255 
100 
100 
211 
Prolific 
331 
Table 8. — Number of experiments in which the relative gains in the weight of ear either 
exceed or are less than the relative gains in the number of ears per plant in single-ear 
and prolific types of corn, showing also the average gains expressed in percentages of the 
results obtained at the closest spacing. 
Total 
num- 
ber of 
experi- 
ments. 
Number of experiments in 
which the gains in the weight 
per ear- 
Average gains expressed in 
percentages of the results 
at the closest spacing. 
Rate of spacing. 
Exceed the Are less than 
gains in the the gains in the 
number of ears number of ears 
per plant. per plant. 
Single ear. 
Prolific. 
Num- 
Wei2ht b ears° f 
ofear " per 
plant. 
Weight 
of ear. 
Num- 
ber of 
Single 
ear. 
Prolific. 
Single 
ear. 
Prolific. 
ears 
per 
plant. 
Second 
Third 
Fourth 
Fifth 
9 
19 
9 
4 
7 
6 
5 
1 
2 



2 
2 
4 
3 
7 
I 
19-4 6.4 
37.2 17.0 
52.0 41.0 
21.7 37.5 
10.1 
19.7 
15. 2 
79. 1 
1 The relative gains in the weight of ears and in the number of ears per plant in the single-ear type were 
equal in one experiment. 
In the single-ear type there was a greater range in the weight of 
ear than in the number of ears per plant. In the prolific type the 
range of variation was greater in the number of ears per plant than in 
