Freezing Injury of Seed Corn 
89 
Table 7 — Effect of freezing temperatures on germination of 
corn differing in moisture content (1913 and 191 Jf) 
Temperature range 16° to 12° F. 
Moisture Moisture 
range in grain 
Germination 
Ice 
observed 
in grain 
Embryos dark 
or light 
Normal 
grain 
Frozen 
grain 
Ratio 
of normal 
to frozen 
Per cent 
Per cent 
Per cent 
Per cent 
65 to 70. . 
67.2 
100 
0 
100:0 
Ice 
* 
60 to 65 . . 
61.8 
100 
0 
100:0 
* 
Dark 
55 to 60 . . 
60.0 
100 
0 
100:0 
Ice 
* 
50 to 55 . . 
54.6 
100 
0 
100:0 
* 
Dark 
48.9 
100 
0 
100:0 
* 
Dark 
47.7 
100 
0 
100:0 
Ice 
* 
45 to 50 . . 
48.5 
100 
0 
100:0 
* 
Dark 
47.6 
100 
0 
100:0 
* 
Dark 
[ 46.2 
100 
0 
100:0 
* 
Dark 
Average. . 
48.0 
100 
0 
100:0 
40 to 45 . . 
44.5 
80 
0 
100:0 
* 
Dark 
f 39.6 
100 
0 
100:0 
* 
Dark 
35 to 40 .. < 
38.5 
100 
0 
100:0 
* 
Dark 
36.8 
100 
0 
100:0 
* 
Dark 
35.9 
75 
0 
100:0 
Ice 
* 
Average . . 
37.7 
93.8 
0 
100:0 
34.6 
100 
0 
100:0 
* 
Light 
34.1 
100 
0 
100:0 
Ice 
* 
30 to 35 . . < 
33.2 
100 
0 
100:0 
* 
Dark 
31.5 
100 
60 
100:60 
* 
Dark and light 
k 31.2 
100 
0 
100:0 
Ice 
* 
Average . . 
32.9 
100 
12.0 
100:12 
29.7 
100 
20 
100:20 
* 
Dark and light 
28.9 
100 
0 
100:0 
* 
Light 
26.5 
100 
100 
100:100 
* 
Light 
25 to 30 .. < 
26.4 
100 
60 
100:60 
* 
Dark and light 
26.4 
100 
60 
100:60 
* 
Light 
26.1 
100 
0 
100:0 
None 
* 
26.0 
100 
0 
100:0 
* 
Dark 
Average . . 
27.1 
100 
34.3 
100:34 
*No observations made. 
