FACTORS FOR YIELD AND QUALITY OF SPRING WHEAT 
27 
Hard Federation and nearly 19 days earlier than Marquis. How- 
ever, because of a slight confusion in the planting plans, the Marquis 
Earent was sown 2 days later and emerged 1 day later than the 
ybrids and Hard Federation. This, together with late rains and the 
fact that there was greater trampling of the soil between rows of 
the hybrids, caused Marquis to mature later, and the results are 
more extreme than would otherwise be the case. 
Table 27. — Segregation in the F 2 generation into 2-day frequency classes for the date 
of ripening of 1,039 plants of MarquisXHard Federation and reciprocal wheat 
crosses grown at Bozeman and Moccasin, Mont., in 1923 
Number of plants 
Station and time of ripening 
F2 hybrids 
Hard Fed- 
eration 
Hard Fed- 
eration X 
Marquis 
Marquis X 
Hard Fed- 
eration 
Total 
Marquis 
Bozeman: 
August 24.5 . ... 
19 
38 
38 
26 
118 
29 
19 
2 
11 
35 
55 
30 
104 
30 
22 
6 
1 
30 
73 
93 
56 
222 
59 
41 
8 
1 
13 
16 
19 
8 
39 
4 
August 26.5 
August 28.5 
August 30.5.. . 
September 5.5 
September 7.5 ... . 
September 9.5 _ .. 
September 11.5. 
::::::::::::: 
. - 
September 13.5 .. . 
September 15.5 . .. . 
11 
September 17.5 . . 
26 
September 19.5 ... . 
45 
September 21.5 
18 
Total 
289 
30. 98±0. 14 
294 
31. 19±0. 13 
583 
31. 09±0. 09 
99 
29. 63±0. 21 
100 
Mean time and probable error: 
September 
18. 9±0. 12 
Moccasin: 
August 10.5 . . .. 
1 
4 
5 
August 12.5 . . 
August 14.5. . ... 
8 
22 
14 
18 
25 
41 
35 
3 
36 
21 
2 
2 
3 
12 
25 
26 
44 
40 
18 
36 
18 
2 
10 
25 
26 
43 
51 
85 
75 
21 
72 
39 
4 
August 16.5 .. 
August 18.5 . . .. 
August 20.5 
August 22.5 . .. .. 
j 
August 24.5 ... . . 
August 26.5 ... 
August 28.5.. .. 
August 30.5 .. . . 
! 
! 
September 3.5_ . . ... 
; 
Total 
226 
24. 54±0. 24 
230 
25. 40±0. 21 
456 
24. 98±0. 16 
Mean time and probable error: 
August 
i 
i 
The reciprocal crosses show but slight, if any, maternal influence 
when compared with the data for date of heading. The Bozeman 
data show a difference between the reciprocal crosses of only 
0.21 ±0.19 days, which is 1.1 times its probable error, and indicates 
odds of but 1.2: 1 that such a difference is due to chance alone. The 
Moccasin data have a difference of 0.86 ±0.32 days, which is 2.7 
times its error, indicating odds of only 13.6: 1. Neither result, there- 
fore, is statistically significant. 
The variability for date of ripening was much greater than for 
date of heading, making it desirable to use 2-day frequency classes 
