6 
BULLETIN 1354, TJ. S. DEPARTMENT OF AGRICULTURE 
The data on the number of suckers, barren plants, and ears per 100 
plants and the weight of shelled grain per ear are of some interest in 
showing the individuality of the different lines and crosses. The 
inability to make accurate comparisons between the different groups 
because of conditions already noted, however, robs these data of 
much of their value. It seems desirable, therefore, to consider only 
the yields and those primarily within groups or between comparable 
averages. 
YIELDS OF SELF-FERTILIZED LINES 
The yields of successive generations of self-fertilized lines are 
brought together in Table 3 to show the relation between (1) the 
lines of descent and yield and (2) the average yields in successive 
generations considered from different points of view. Because of 
differences in the productiveness of different parts of the field, strain 
comparisons should be made only when taking into account the 
yields of the adjacent checks. 
Table 3. — Yields of successive generations of self-fertilized lines of corn 
Selfed 3 generations 
Selfed 4 generations 
Selfed 5 generations 
Selfed 6 generations 
Pedigree No. 
Yield 
per 
acre 
(bush- 
els) 
Pedigree No. 
Yield 
per 
acre 
(bush- 
els) 
Pedigree No. 
Yield 
per 
acre 
(bush- 
els) 
Pedigree No. 
Yield 
per 
acre 
(bush- 
els) 
5.0 
J2-2-2-S 
23.3 
*24.5 
/2-2-2-4-S 
14.5 
1.9 
2-2-2-4-4-S 
2-2-2-2-3-S 
13.9 
\2-2-2-2-S 
12-2-1-S 
Strain mean 
5.0 
23.9 
8.2 
10.8 
3-1-1-S 
J3-1-1-3-S 
3-1-1-3-1-S 
3-1-1-4-3-S 
35.9 
12.1 
21.2 
19.6 
27.1 
\3-l-l-4-S 
35.9 
12.1 
20.4 
17.9 
5-1-2-S 
/5-1-2-5-S 
15-1-2-3-S- :. 
5-1-2-5-2-S 
5-1-2-3-1-S 
5-1-S 
13.0 
13.8 
21.2 
9.7 
12.3 
6.1 
Strain mean 
13.0 
13.8 
15.5 
9* 
(9-2-1-S. 
9-2-1-2-S 
9-2-1-2-1-S 
9-2-3-2-3-S 
9-2-S 
20.9 
41.1 
*20.2 
19.6 
*25.1 
27.7 
\9-2-2~S- 
9-2-2-1-S. ___ 
Strain mean 
20.9 
30.7 
22.4 
25.8 
[12-l-l-S 
/12-1-1-1-S. 
\12-l-l-2-S 
12-1-2-3-S 
12-1-1-1-2-S 
15.5 
27.5 
9.4 
23.5 
*21.7 
12.0 
24.0 
12-1-2-3-2-S 
15.5 
18.5 
19.1 
17.6 
18.1 
18.1 
17.4 
17.4 
19.8 
21.8 
19.2 
14.7 
17.1 
16.3 
20.1 
10.8 
16.3 
Average B 2 _ 
16.6 
19.3 
Average D 4 . 
8.4 
1 Average of strain means, including all lines. 
2 Average of strain means, excluding lines (marked *) not represented in all generations. 
3 Average yields of the better of each of four pairs of lines in the sixth generation that were represented 
by comparable pairs in the fifth generation and of their antecedent lines. 
* Average yields of the poorer of each of four pairs of lines in the sixth generation that were represented, 
by comparable pairs in the fifth generation and of their antecedent lines, comparable to average C. 
A general tendency is evident for lines and strains to maintain the 
same relative positions in the different generations. The outstanding 
exceptions to this tendency occur in the third and fourth generations, 
