FACTORS FOR YIELD AND QUALITY OF SPRING WHEAT 
23 
This indicates that at least two genetic factors are involved for early 
heading in this cross and that in the F 3 generation some F 2 families 
appear to be segregating in a simple 3 : 1 ratio, as found by Florell (9) . 
Some of the earliest and latest heading F 3 plants were included 
among the families studied on an individual-plant basis, in order to 
determine their breeding behavior in F 3 . It was desired to determine 
whether transgressive segregation occurred for date of heading. 
Data for the two earliest studied strains compared with the nearest 
studied check row of Hard Federation and for the two latest studied 
F 3 strains compared with the nearest studied check row of Marquis 
at each of the two stations are given in Table 23. 
Table 23. — Dates of heading of individual F 3 plants from early and late strains of 
Marquis-Hard Federation crosses, in comparison with the parents, grown at 
Bozeman and Havre, Mont., in 1924 
Bozeman strain and row 
numbers 
Havre strain and row numbers 
Dates of 
Early heading 
Late heading 
Early heading 
Late heading 
heading 
A3-90; A3-92; 
223 224 
Hard 
Feder- 
ation; 
220 
A2-77; 
17 
Bl-78; 
4 
Mar- 
quis; 
10 
B3-84; 
222 
; Hard 
A3-92; Feder- 
139 ation; 
40 
A2-77; 
72 
Bl-78; 
26 
Mar- 
quis; 
10 
8 
22 
22 
3 
Aug. 5 
4 3 
24 12 
11 : 15 
5 ! fi 
Aug. 6 _ 
1 
1 
2 
1 
3 
4 
2 
1 
7 
12 
7 
10 
Aug. 7_ 
1 
8 
15 
Aug. 8. 
Aug. 9. 
4 
1 
3 
5 
2 
6 
1 
1 
2 
5 
1 
12 
6 
7 
1 
5 
5 
4 
15 
6 
4 
1 
Aug. 10. ... 
12 21 
7 13 
7 1 4 
2 
Aug. 11 
1 
6 
2 
4 
3 
5 
6 
5 
6 
4 
Aug. 12 
Aug. 13 
4 1 3 
2 
1 
9 
Aug. 14 
1 
5 
1 
8 i 
27 
Aug. 15__ 
2 
9 
4 
4 
4 
3 
3 
1 
2 
2 
:- 
1 
10 
Aug. 16. _ 
1 
7 
Aug. 17 
4 I 3 
1 1 2 
l\ I 
1 2 
«-..... 1 _ 
3 
Aug. 18 i 
1 
1 
Aug. 19 I 
i 
5 
3 
3 
2 
Aug. 20 
1 
Aug. 21 
1 
1 
1 
Aug. 22_._ 
1 
1 
Aug. 23 
* 1 
Aug. 24 
2 
} 
Aug. 25 
2 

Aug. 26 
1 
3 
1 
1 
Aug. 27.. 
Aug. 28 - 
Total 
Average 
date, Aug . 
60 
7.8 
52 64 
8.2 6.0 
49 
16.2 
53 
16.6 
62 
14.3 
42 34 64 
12.7 11.6 9.9 
35 
15.9 
16 
19.2 
62 
15.0 
The three early F 3 strains A3-90, A3-92, and B3-84 are the 
progeny of F 2 plants which headed on July 13, 14, and 16, 1923. 
The average date of heading of Hard Federation in 1923 was July 14. 
In the F 3 generation none of these strains was earlier than Hard 
Federation in average date of heading. 
Of the late F 3 strains studied, the F 3 plant, of which family Bl-78 
was the progeny, was later than all others and headed on July 26, 
while the F 2 generation of strain A2-77 headed on July 23, 1923. 
The average date of heading for the late Marquis parent was July 
24, 1923. In the F 3 generation both of these strains headed signifi- 
cantly later than the nearest studied Marquis check row at both 
