FACTORS FOE YIELD AND QUALITY OF SPRING WHEAT 
37 
less than that of the nearest studied Marquis check. This difference 
is about 4.2 times its error. At Havre, however, this same strain 
averaged only 0.2 day shorter in fruiting period than Marquis, indi- 
cating the importance of environment in regulating such physiologic 
behavior. Strain Bl-78 was significantly shorter in fruiting period 
than Marquis at both stations, the difference at Bozeman being 
2.56 ±0.61 days and at Havre 4.36 ±0.59 days. The strain of next 
shortest fruiting period at Havre was B2-93, but the fruiting period 
of this strain was not significantly shorter than that of Marquis. 
In the F 2 generation the mother plant of strain B2-93 had a long 
fruiting period, 51 days, in contrast to strains Bl-78 and A2-77, 
whose mother plants in the F 2 generation had short fruiting periods 
of 38 and 41 days, respectively. 
Table 35. — Fruiting period of individual F 3 plants of short and long fruiting 
strains of Marquis-Hard Federation wheat crosses, in comparison with the 
parents, grown at Bozeman and Havre, Mont., in 1924 
Bozeman strain and row Nos. 
Havre strain and row Nos. 
Short fruiting 
Long fruiting 
Short fruiting 
Long fruiting 
Fruiting period 
A2-77; 
17 
Bl-78; 
4 
Mar- 
quis; 
10 
| 
Al-34; Bl-65; 
45 1 113 
Hard 
Fed- 
era- 
tion; 
20 
B2-93; 
158 
Bl-78; 
26 
Mar- 
quis; 
10 
A3- 
101; 
308 
Bl-65; 
203 
Hard 
Fed- 
era- 
tion; 
300 
22.5 days 
1 
4 
3 
2 
4 
1 
1 
24.5 days .. 
4 
3 
4 
12 
3 
7 
2 
26.5 days... 
3 
3 
8 
34 
14 
28.5 days 
30.5 davs 
1 
5 
32.5 days 
2 
12 
17 
7 
3 
17 
12 
6 
4 
34.5 days. 
2 
13 
36.5 days . . . . 
1 
1 
2 
27 
38.5 davs 
1 
2 
40.5 days 
2 
1 
::::::: r: 
1 
42.5 days 
5 
i 
i 
3 
4 
7 
15 
12 
6 
2 
4 

44.5 days. . 
2 2 
2 ! 2 
3 1 4 
2 j 3 
9 11 
7| 8 
; ! '- 
2 j 1 
3 1 
7 
46.5 days... 
2 
1 
1 
7 
9 
7 
7 
7 
7 
2 
48.5 days 
50.5 days ... 
-- 
2 
5 
2 
6 
6 
11 
9 
4 
52.5 davs 

54.5 days 
56.5 days . 
....... 
58.6 davs 

60.5 days.. 
1 j 4 

62.5 days 
1 l 
64.5 days 
2 1 
Total 
33 38 
53 
36 ; 49 
54 35 
16 62 
38 
39 
51 
Average 
period in 
days 
! i 1 i 
49. 1 50. 1 j 52. 7 | 55. 8 j 55. 3 
55.6 30.6 
27. 9 32. 2 
36.0 
35.7 
35.2 
The three F 3 strains of longest fruiting period at both stations, 
Al-34, Bl-65, and A3-101, were the progeny of F 2 plants with fruit- 
ing periods of 43, 47, and 52 days, respectively, in 1923. The average 
fruiting period of Hard Federation in 1923 was 46 days. Of seven 
plants having the longest fruiting period in the F 2 generation, none 
averaged the longest in F 3 of 25 strains studied at Bozeman in 1924. 
Strain Al-34 was longest in fruiting period at Bozeman, but at 
Havre it had a slightly shorter fruiting period than Marquis. Strain 
Bl-65 slightly exceeded Hard Federation in average length of fruiting 
