48 
BULLETIX 1403, U. S. DEPARTMENT OE AGEICULTLTtE 
Table 44. — Yield of individual F$ plants from low and high yielding strains of 
Marquis-Hard Federation wheat crosses, in comparison with the parents, grown 
at Bozeman-and Havre, Mont., in 192J/. 
Bozeman strain and row Xos. 
Havre strain and ro^r Xos. 
Low yielding 
High yielding 
Low yielding 
High yielding 
Yield per plant 
Ha:a 
B2-9S; Feder- 
227 ation; 
220 
Al-24; Bl-65; ^ 
S 113 W*> 
B1-7S: B2-9S; 
-: 
::; 
Mar 
:ms 
10 
£. Bl-€5; B1-4T 
203 316 
Hard 
Fed- 
0.5 gram... 
1." grams.. 
I :" r;i::.. 
3.5 grams.. 
4 : grams. . 
:.■: grams.. 
6.5 grams.. 
: grams. . 
5 : grams.. 
9.5 grams.. 
10.5 grams. 
11.5 grams. 
12.5 grams. 
13.5 grams. 
1- . : grams. 
15.5 
g:a=5_ 
3 4 
2 
3 3 
6 2 
3 3 
1 1 
9 
1 1 
3 
1 
Among the Mgh-yielding strains Al-24 was first at Bozeman and 
Bl-65 first at Havre. The latter strain also gave a high yield at 
Bozeman. It outyielded the higher yielding parent at both points. 
The mean yields and differences of this strain and the high-yielding 
parent at each point are as follows: 
* Yield per plant 
Bozeman: (grams) 
Bl-65 6. 07 = 0. 32 
Marquis 4.72 = .21 
Difference 1.35= .38 
Havre: 
Bl-65 3. 24 = 0. 14 
Hard Federation 2.12= .09 
Difference 1. 12= . 17 
The differences are both significant. The parent plant in the 
F 2 generation yielded 11 grams and was one of those of highest 
yield. It appears therefore that from a high-yielding F 2 plant an 
Y 3 strain has been obtained which gives promise of being significantly 
higher in yield than either parent when grown under conditions 
where each parent is best adapted. Other strains also have been 
obtained which are similarly promising. 
The frequency distribution of the yields of all F 3 plants studied 
and those from duplicate parent check rows are g;iven in Table 45. 
and the Bozeman data are shown graphically in Figure 9. 
