64 
BULLETIN 1403, U. S. DEPARTMENT OF AGRICULTURE 
Table 60. — Correlation between height of F^ plants and average height of F 3 strains 
of Marquis-Hard Federation wheat crosses grown at Moccasin, Mont., in 1923 
and 1924 
Height of row, 1924 
Height of plant, 1923 (inches) 
28 
30 
32 
34 
36 
38 j 40 
42 
44 
46 
Total 
38 inches 
2 
2 
4 
6 
4 
3 
! 1 
2 4 
f 2 
7 ; 3 
9 i 8 
7 j 8 
3 6 
.. .. 2 J ? 
1 
1 
1 
3 
• 3 
5 
8 
2 
3 
4 
39 inches 
1 
..... 
1 
1 
10 
40 inches.. < 
6 
41 inches 
1 
1 
1 
4 
18 
42inches 
1 
1 
I 
2 
2 
2 
..... 
30 
43 inches 
29 
44inches 
34 
45 inches 
15 
46 inches ... .. 
4 
Total 
1 
3 
2 
8 
21 
30 ! 42 
i 
27 
13 3 
150 
r=0.317±0.050. 
Significant positive correlations were obtained in all instances 
between height and yield. The average correlation, 0.452, indicates 
the importance of environment in affecting both height and yield. 
Of the five factors here studied, height has given the highest coefficient 
of correlation with yield. 
The Bozeman F 3 data are shown in Table 61 and represent the 
association of height and yield under favorable conditions. Under 
unfavorable conditions, such as at Havre, height and yield are more 
highly correlated. 
Table 61. — Correlation between height of F 3 strains and yield of Marquis- Hard 
Federation wheat crosses grown at Bozeman, Mont., in 1924 
Height of row 
Average yield of plant (grams) 
2.5 
3.5 
4.5 
5.5 
6.5 
7.5 
8.5 
Total 
1 
3 
12 
12 
1 
6 
14 
21 
23 
7 
30.5 inches 
2 
2 
4 
12 
22 
2 
8 
9 
10 
5 
2 
25 
32.5 inches ... . ... .. . . 
55 
34.5 inches ...... . 
2 
2 
6 
_. 
68 
36.5 inches 
3 5 
46 
38.5 inches _ . 
20 
3 
Total 
4 
36 
81 i 56 
36 
10 
1 224 
r=0.381±0.039. 
On the average, height was found to be negatively correlated with 
crude-protein content. In three out of four experiments, however, 
the correlations were small and not significant. Only at Havre, under 
droughty conditions and where height was very highly correlated 
with yield, was there an important negative correlation between 
height and crude-protein content. 
YIELD 
Coefficients of correlation obtained for yield one year with another 
at both Bozeman and Moccasin and at Bozeman one year with 
Havre the next year are given in the first half of Table 62, followed 
by those for yield with crude-protein content. 
