FACTORS FOR YIELD AND QUALITY OF SPRING WHEAT 
45 
normal plants was not present in each row. At Bozeman and Havre 
a definite number of plants was grown in each, row, and yields also 
have been computed per plant. This was not possible with the 
Moccasin data, seeding at this station not being definitely spaced. 
The data obtained by both methods, distributed in frequency classes, 
are given in Tables 42 and 43 and shown graphically in Figure 10. 
Table 41. — Segregation in the F% generation into frequency classes for yield of 1,045 
plants of Marquis-Hard Federation and reciprocal wheat crosses grown at Boze- 
man and Moccasin, Mont., in 1923 
Bozeman 
Moccasin 
Yield per plant 
F2 hybrids 
F2 hybrids 
Hard 
Federa- 
tion X 
Marquis 
Marquis 
X Hard 
Federa- 
tion 
Total 
Hard 
Federa- i Marquis 
tion 
Hard 
Federa- 
tion X 
Marquis 
Marquis 
X Hard 
Federa- 
tion 
Total 
0.5 gram . . 
1 
1 
4 
9 
33 
54 
105 
138 
108 
68 
46 
15 
4 
2 
1 
2 
6 
16 
1 
5 
15 
25 
21 
17 
9 
15 
9 
29 
22 
18 
5 
13 
9 
6 
2 
1 
7 
4 
9 
18 
12 
15 
30 
22 
35 
22 
15 
13 
3 
7 
7 
1 
2 
4 
5 
19 
19 
46 
66 
56 
38 
24 
11 
4 
2 
5 
12 
15 
12 
2.5 grams 
4 
14 
35 
59 
19 
34 
4.5 grams 
27 19 
39 
5.5 grams . 
20 
14 
6 
4 
1 
1 
14 
8 
15 
8 
1 
29 
6.5 grams . . 
72 
52 
30 
22 
4 
24 
7.5 grams 
45 
8.5 grams 
31 
'9. 5 grams ._ 
64 
10.5 grams . 
44 
11.5 grams . . 
2 
1 
33 
12.5 grams 
18 
13.5 grams . . _ . 
16 
16 
15.5 grams ._ _ - 1 - - 
13 
3 
17.5 grams ._ . - . 
2 
5 
1 
1 
19.5 grams 
1 
1 
1 
20.5 grams 
2 
2 
1 
2 
21.5 grams 
1 
1 
3 
2 
23.5 grams 
26.5 grams 
1 
1 
28.5 grams .__... 
■30.5 grams 
1 
1 
Total 
293 
6. 50±. 07 
294 ' 587 
98 
5. 06±. 12 
100 
5. 30±. 16 
228 
8. 47±. 21 
230 
8. 92±. 18 
458 
Mean yield in 
grams and 
probable 
error 
6. 84±. 08 
6. 67±. 05 
8. 70±. 14 
The Bozeman row data show that the yields of the F 3 hybrids 
average between the average yields of the parent check rows. The 
Moccasin data show that the average yield of the hybrids is less 
than that of both the parent checks. At both stations in 1924 
Marquis outyielded Hard Federation. Largely because of the smaller 
number of check rows the hybrids appear to be much more variable 
in yield than the parent varieties. At both stations the extreme high 
and low yields of check rows were exceeded by hybrid strains. 
At Moccasin, as previously noted, the plants were not definitely 
spaced, the rows being sown at the rate of 2.3 grams per rod row. 
Stands were not uniform, principally because of the dwarf plants 
