46 
BULLETIN 1403, TJ. S. DEPARTMENT OF AGRICULTURE 
which appeared in different ratios in some of the hybrid strains. The 
yields of the rows producing these dwarfs were compared with the 
yields of rows in which no dwarfs appeared. The result follows : 
Average acre yield 
(bushels) 
F 3 hybrids having no dwarfs 29. 49 ±0. 38 
F 3 hybrids having dwarfs 26. 88± .47 
Difference, 
61 
60 
The difference, 2.61 ±0. 60 bushels, is significant. Dwarfs, there- 
fore, were a factor in the low yields of the F 3 hybrids when compared 
with the parents on a row basis. 
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Fig. 10.— Frequency distribution of F3 hybrid wheat strains and the range of variation of the 
Marquis and Hard Federation parent checks, together with their average yield per plant at 
Havre and Bozeman and yield per acre at Moccasin and Bozeman in 1924 
Table 42. — Yield per acre in the F 3 generation of 374 Marquis-Hard Federation 
wheat hybrids, in comparison with 44 parent checks grown in nursery rows at 
Bozeman and Moccasin, Mont., in 1924 
Number of rows 
Yield per acre 
Bozeman 
Moccasin 
F S hy- 
brids 
Hard 
Federa- 
tion 
Marquis 
F 3 hy- 
brids 
Hard 
Federa- 
tion 
Marquis 
2.5 bushels. . 
1 
1 
7 
24 
46 
63 
48 
19 
7.5 bushels.. . 
I 
12.5 bushels 
2 
17.5 bushels . 
2 
2 
1 
4 
3 
12 
20 
61 
39 
15 
22.5 bushels 
7 
3 
3 
2 
4 
_. 
27.5 bushels... 
32.5 bushels. . . 
6 
37.5 bushels.. . . . ___ 
42.5 bushels.. .. 
10 
2 
1 
47.5 bushels ....... 

52.5 bushels 
2 
| 
57.5 bushels 
1 
Total 
Average yield in bushels 
224 
27.86 
13 
25.96 
13 
30.19 
150 
28.23 
9 
29.72 
9 
30.83 
