FACTOBS FOB YIELD AND QUALITY OF SPRING WHEAT 
65 
Table 62. — Correlation coefficients and probable errors of yield in F 2 and F z genera- 
tions and of yield with crude-protein content of Marquis-Hard Federation wheat 
crosses grown at Bozeman, Moccasin, and Havre, Mont., in one or both of the 
years 1928 and 1924 
Yield 
Correlated with— 
Number 
of F 2 
plants 
or F3 
strains 
Correlation 
coefficient 
and probable 
error 
Pa, Bozeman, 1923. 
Fs, Moccasin, 1923. 
/F3, Bozeman, 1924 . 
\F 3 , Havre, 1924.... 
Yield F 3 , Moccasin, 1924. 
Yield. 
224 
299 
150 
0. 225±0. 043 
.004± .039 
. 255± . 051 
Total or average - 
Bozeman, 1923 
673 
134 
F2, Bozeman, 1923. 
Bozeman, 1924 lomde motem J Fs ' Bozeman < 1924 - 
Moccasin, 1924 joruae protein < F ^ Moccasin> 1924 _ 
Havre, 1924. 
Total or average. 
.Fs, Havre, 1924. 
507 
224 
118 
297 
,231± .027 
256± . 042 
,201± .060 
732± .018 
1,206 
-.261 
The data show that yield was positively correlated to a significant 
degree at both Bozeman and Moccasin one year with another, but 
that there was practically a zero correlation between the yield at 
Bozeman one year with that of Havre the year following. This 
shows the necessity of making selections at the station at which 
the wheats are to be tested and in the section for which they are 
being developed. The inheritance of yield as measured in grams 
from F 2 plants with that of bushels per acre from F 3 strains at 
Moccasin is given in Table 63 and illustrates the amount of correla- 
tion which was obtained when F 2 plants were definitely spaced and 
favorable conditions were present in both years. 
Table 63. — Correlation between yield in grams of F% plants and the yield per acre 
in bushels of F z rows of Marquis-Hard Federation wheat crosses grown at Moc- 
casin, Mont., in 1928 and 1924 
Acre yield of F s rows 
Yield of F 2 plants, 1923 (grams) 
Total 
in 1924 
2 
5 
8 
11 
14 
17 
20 
23 
26 
29 
12.5 bushels . . 
1 
1 
3 
1 
20 
14 
4 
1 
2 
17.5 bushels . ... 
4 
5 
8 
1 
5 
4 
19 
8 
2 
12 
22.5 bushels 
1 
4 
9 
5 
2 1 3 
3 ! 2 
3 | 
2 2 
20 
27.5 bushels 
1 
1 
.. 
1 
1 
61 
32.5 bushels 
1 
39 
37.5 bushels 
15 
42.5 bushels.. 
1 
1 
Total 
2 
18 
38 
43 
26 
11 : 7 
2 
1 
2 
150 
r=0.255±0.051. 
On the average, yield was found negatively correlated with crude- 
protein content. This relationship was found with F 2 plants grown 
at Bozeman and from F 3 strains grown at Moccasin and Havre. 
The F 3 strains at Bozeman, however, gave a positive correlation. 
The average correlation of —0.261 may or may not represent the 
usual association. Exceptions to this negative relationship are 
possible, as shown by the data from Bozeman which are given in 
Table 64. There conditions were favorable, causing high yields and 
heavyweight kernels having a small percentage of "yellow berry." 
