14 
Journal o f Agricultural Research 
Vol. XXIX, No. I 
Table VIII.— Mean yield and its probable error for five awn classes of Fz plants 
of Kota-Hard Federation crosses grown at Mandan, N. Dak., in 1928 
Class 
Number 
of plants 
Yield in 
grams, 
mean and 
probable 
error 
Awnless......_;.. 
126 
2. 79±0. 06 
Apically-awnletted... 
403 
3. 02± .04 
Awnletted___ _____ 
111 
3. 02± .07 
Short-awned__... 
73 
3. 06± .08 
Awned.... _ _ _ 
187 
3. 30± . 06 
Total and average... 
900 
3. 05± .03 
These further data show a similar 
definite relationship between the awn 
length and yield. The difference be¬ 
tween the extreme classes in this latter 
case is 18 per cent or 0.51 ±0.08 gram. 
As this difference is over six times its 
probable error it certainly may be 
considered significant. Many factors 
are associated with the complex char¬ 
acter designated yield, and it appears 
that the factors for the development of 
awns are among those involved. 
COLOR OF THE GLUMES 
Glume colors are variously classed as 
white, yellowish, brown or red. Two 
classes usually are used, namely, white 
and brown. Those classed as white may 
vary from nearly white to yellowish 
and those classed as brown may show 
various shades of brown to a brownish 
red. Biffen {4) found brown glume 
color dominant to white in the single 
3 to 1 ratio. No other ratio is known 
to have been reported by other workers 
in crosses between common wheats. 
The present study includes F 2 data 
on the segregation for color of the 
glumes at the three points, Davis, 
Calif., St. Paul, Minn., and Mandan, 
N. Dak. The results obtained are 
given in Table IX. 
Table IX.— Segregation of 4)44-8 F 2 plants of the Kota-Hard Federation and 
reciprocal crosses into two classes for color of glumes, when grown at Davis, 
Calif., St. Paul, Minn., and Mandan, N. Dak., in 1922 
Source and cross 
Number; 
of Fi 
families 
Number and percentage of F 2 plants having— 
Devia¬ 
tion 
from 3:1 
ratio J 
| 
Proba¬ 
ble 
error 
Brown glumes 
White glumes 
Total 
number 
Number 
Per cent 
Number 
Per centj 
DAVIS, CALIF. 
KotaXHard Federation- 
11 
245 
70.0 
105 
30.0 
350 
18 
5.46 
Hard Federation X Kota. 
19 
490 
72.1 
190 
27.9 
680 
20 
7.62 
Total---- 
30 
735 
71.4 
295 
28.6 
1,030 
38 
9.38 
ST. PAUL, MINN. 
KotaXHard Federation_ 
20 
376 
57.7 
276 
42.3 
652 
113 
! 7.46 
Hard Federation X Kota_ 
40 
665 
69.3 
294 
30.7 
959 
54 
9.04 
Total. ... 
60 
1,041 
64.6 
570 
35.4 
1,611 
167 
11.73 
MANDAN, N. DAK. 
KotaXHard Federation.. 
12 
789 
68.9 
356 
31.1 
1,145 
70 
1 9.88 
Hard Federation X Kota. 
15 
502 
76.5 
154 
23.5 
656 
10 
7.48 
Total... 
27 
1,291 
71.7 
510 
28.3 
1,801 
60 
12.40 
ALL THREE STATIONS 
KotaXHard Federation.. 
23 
1,410 
65.7 
737 
34.3 
2,147 
200 
13. 54 
Hard Federation X Kota. 
45 
1,657 
72.2 
638 
27.8 
2,295 
64 
13.99 
Grand total .. 
68 
3,067 
69.0 
1,375 
31.0 
4,442 
264 
| 19.48 
