G6 Nebraska Agricultural Exp. Station , Research Bui . £0 
Table 22. — Comparison of first generation hybrids and their 
pure line parents; Hogue's Yellow Dent corn , (Class IX). 
1916 . 
Hybrid 
Stalk height 
Yield, grain per acre 
Hybrids 
Parents 
Hybrids 
Parents 
Fi 
f 2 
Female 
Male 
Fi 
F2 
Female 
Male 
Feet 
Feet 
Feet 
Feet 
Bu. 
Bu. 
Bu. 
Bu. 
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
(1) 
(8) 
(9) 
4X 12.. .. 
6.0 
5.7 
3.7 
4.6 
38.8 
21.6 
2.3 
14.8 
4X1 
5.9 
5.7 
3.7 
3.8 
53.2 
31.4 
2.3 
14.5 
12 X 5 
6.7 
6.2 
4.6 
4.5 
44.6 
15.9 
14.8 i 
3.1 
10 X 5 
6.3 
5.7 
4.5 
4.5 
43.3 
17.2 
15.4 : 
3.1 
Average .... 
6.2 
5.8 
4.1 
4.3 
45.0 
21.5 
8.7 
8.9 
8X2 
6.5 
4.7 
4.4 
3.8 
66.2 
38.3 
10.8 
8.0 
12 X 2 
6.7 
4.7 
4.6 
3.8 
58.0 
! 28.0 
14.8 
8.0 
10 X 12. . . . 
6.7 
5.7 
4.5 
4.6 
51.5 
24.1 
15.4 
14.8 
2X10. .. 
7.0 
6.0 
3.8 
4.5 
58.2 
i 24.0 
8.0 1 
15.4 
Average .... 
6.7 
5.3 
4.3 
4.2 
58.5 
28.6 
12.2 
11.5 
Original .... 
6.5 
6.5 
6.5 
6.5 
37.5 
37.5 
37.5 j 
37.5 
These data are compiled from Tables 14 and 16. 
individual plant and ear weights of their inbred parents. The 
hybrids are grouped into the five highest, eight intermediate, and 
five lowest, yielding hybrids. The respective average yields 
of these three hybrid groups were 72.2, 64.1, and 47.2 bushels 
per acre, which is equivalent to the relative yields of 100, 80, 
and 65 per cent. The corresponding relative ear weights of the 
inbred parents of the three groups were 100, 8G, and 65, while 
the respective relative total plant weights were 100, 97, and 86 
per cent. 
There appears to he some general correlation between pro- 
ductivity of the pure line parents and that of their hybrid off- 
spring. Exceptions to this general relation occur. 
It is doubtful if maximum increased vigor as indicated by 
plant size is necessarily the vigor character to be striven for. 
Some of the most productive hybrids which this Station has 
produced are shorter growing and have a smaller vegetative de- 
velopment than the original corn from which they came. 
