FACTORS FOR YIELD AND QUALITY OF SPRING WHEAT 
31 
F 3 strain B2-94 averaged earlier, although not significantly so, than 
the nearest labeled check row of Hard Federation. At Havre, how- 
ever, the same strain averaged later than Hard Federation. Strain 
Bl-47 was the second earliest strain studied at Bozeman in 1924 and 
also one of the earliest at Havre, this family being the progeny of an 
F 2 plant which ripened on September 1, 1923. 
Among the late strains in F 3 , A2-77 appeared significantly later 
than Marquis at Havre, the difference, 0.66 ±0.16, being 4.1 times its 
error. At Bozeman, on the other hand, this strain averaged about 
two days earlier than Marquis. The F 2 parent of this strain ripened 
on September 2, 1923. The F, parents of the two latest F 3 strains 
at Bozeman, Bl-78 and B3-5, also were not late-ripening plants in 
the F 2 generation, having ripened on August 24 and 27, respectively. 
Of the late strains at Bozeman Bl-78 averaged equally as late as 
Marquis, but no strain was later than the late parent in average 
date of ripening. 
The data as a whole can not be considered sufficient evidence to 
prove transgressive segregation, but are evidence of the importance 
of environment in determining all plant physiological responses. 
Table 31. — Dates of ripening of 1,681 F% plants of Marquis-Hard Federation 
wheat crosses, in comparison with the parents, grown at Bozeman and Havre, 
Mont., in 1924 
Station and time of ripening 
August 13.5 
August 15.5 
August 17.5.-.. 
August 19.5 
August 21.5 
August 23.5.... 
August 25.5 
August 27.5.... 
August 29.5.... 
September 0.5. 
September 2.5. 
September 4.5. 
September 6.5. 
September 8.5. 
Total 
Average time of ripening, September . 
Havre: 
August 9-. 
August 10. 
August 11- 
August 12. 
August 13- 
August 14- 
August 15 _ 
August 16. 
August 17. 
August 18- 
August 19- 
August 20. 
August 21. 
F 3 
hybrid 
Total. 
Average time of ripening, August. 
7 
7 
11 
73 
9 
54 
56 
27 
25 
68 
134 
184 
212 
956 
1.2 
29 
62 
106 
174 
149 
115 
46 
23 
11 
2 
725 
Hard 
Federa- 
tion 
107 
.3 
13.i 
Marquis 
102 
5.3 
Ik 1 
The variation in the number of days required for the different 
families to pass from first to fully ripe, when compared with the 
parents, is more striking than in the case of date of heading, partly 
