FACTORS FOB YIELD AND QUALITY OF SPRING WHEAT 
49 
Table 45. — Yields of 2,112 F z plants of Marquis-Hard Federation wheat crosses, 
in comparison with the parents, grown at Bozeman and Havre, Mont., in 
Bozeman 
Havre 
Yield per plant 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
F 3 
hybrids 
Hard 
Federa- 
tion 
Marquis 
91 
173 
150 
11 
13 
25 
23 
21 
9 
9 
9 
3 
1 
2 
8 
15 
20 
16 
20 
17 
5 
6 
3 
3 
2 
168 
289 
182 
59 
19 
5 
3 
29 
56 
25 
4 
3 
39 
59 
17 
3.5 grams 
172 
187 
131 
127 
103 
8 
1 
1 
8.5 grams ._ - . 67 
52 
10.5 grams _ .. 
48 
30 
23 
14 
11 
2 
1 
2 
2 
1 
1 
19.5 grams . . . ... ._ . .. 
Total 
1,387 
5.14 
126 
3.92 
116 
4.15 
725 
1.81 
117 
1.61 
125 
Average yield in grams . . . 
1.51 
The data show that at both stations the average yield of the hy- 
brid plants exceeded that of the parent varieties. This accords 
with the Bozeman F 2 data. It therefore appears that transgressive 
segregation has occurred for higher yielding hybrid plants than 
those of either the Hard Federation or Marquis parents. 
CRUDE-PROTEIN CONTENT 
The crude-protein content of wheat is a quality factor which in 
recent years is receiving increasing attention and is reflected in the 
price of the grain when marketed. It varies with environment 
and yield, but in part is controlled by factors associated with variety. 
Lyon {12) and Roberts {15) have studied the variation and in- 
heritance of crude-protein content within different plants and pure- 
line strains of a variety. The present study was designed to deter- 
mine how the varietal factors which determine crude-protein con- 
tent are inherited in hybrids. 
The crude-protein content of the grain from F 2 and F 3 generations 
and parent plants and the bulk grain from nursery rows of F 3 strains 
and parents was determined. 3 Data on F 2 plants were obtained 
only from Bozeman material. Because of limited quantities of 
grain from single plants, single determinations were made on whole- 
wheat samples. The data are given in Table 46 and are shown 
graphically in Figure 1 1 . 
3 The crude-protein determinations were made in the research laboratory of the grain division of the 
Bureau of Agricultural Economics. The work was all done under the direction of D. A. Coleman, in charge 
of the laboratory. The writers wish to express their appreciation to the officials of the Bureau of Agri- 
cultural Economics and of the grain division of the bureau, and particularly to Doctor Coleman, for the 
many courtesies extended in this cooperation. The writers wish also to express their appreciation to H. C. 
Fellows, who with Doctor Coleman made the determinations on the F2 material, and to J. C. Wangler, 
junior biochemist, Bureau of Plant Industry, who made the determinations of the F3 generation. 
