orn Hybrid
jk f t :, '' Maturity Rating
for Alabama
Department of Agronomy and Soils Series No. 127
Alabama Agricultural Experiment Station
Auburn University Auburn University, Alabama
Lowell T. Frobish, Director
January 1989

Corn Hybrid Maturity Rating for Alabama
Donald L. Thurlow & 
Wiley C. Johnson 1/
Vegetative and reproductive development of corn is dependent
on adaptation to a particular climate. Major factors in the
environment which condition this growth pattern include
temperature, moisture, fertility, intensity of radiation, and
photoperiod. Although seed companies rate their own hybrids,
little information is available which compares the maturity of a
large number of hybrids grown under the same environmental and
cultural conditions.
An experiment was conducted at the Plant Breeding Unit near
Tallassee, Alabama, to accurately determine the number of days
required from planting to silage harvest (approximately 35
percent moisture in the grain), and to combine-ready
(approximately 25 percent moisture) for the 149 cornhybrids
tested in the regular and preliminary corn hybrid yield trials.
Two rows 30 feet long were planted March 31, 1988. All
plots were treated equally with nitrogen rates of 60 pounds N per
acre at planting and 100 pounds N sidedressed May 9. The plant
population was 20,000 plants per acre. Weeds were controlled
with 2 pounds per acre of Dual and 2 pounds per acre of
Atrazine, along with cultivation. One pound per acre of Sevin
was applied June 1 and June 13 to control corn earworms.
1/Associate Professor and Professor of Agronomy and Soils,
Respectively
Harvests were made twice per week from July 21 through August 25.
Each harvest consisted of three ears randomly taken from each
plot. The ears were shelled immediately, and moisture was
measured with a Burrows model 700 digital moisture computer. If
the grain was higher in moisture than the meter would measure
accurately, about 40 percent, the grain was weighed at harvest,
partially dried, reweighed, and then the moisture measured with
the Burrows machine. The weight lost during drying was used to
calculate the original high moisture values. The mid-silk data
were the number of days from planting until one-half of the
plants in the plot were showing silks. The maximum and minimum
air temperatures were recorded daily from March through August.
Rainfall was also recorded at the site. The test was irrigated
once on June 6 with 1.5 inches of water.
The grain moisture percent measured at each harvest and the
days after planting for each harvest date are shown in table 1.
Also shown are the computed days to 35 percent moisture, or
silage-ready grain moisture, and days to 25 percent moisture, or
combine-ready grain moisture. It should be noted, however, that
grain over 25 percent moisture cannot be directly marketed and
usually must be dried to at least 20 percent before elevators
will accept it in Alabama. The days to mid-silk are also shown
in this table.
The daily maximum and minimum air temperature and rainfall
at the test site are shown in table 2.
-4-
Table 1. Corn Grain Moisture Percentage from 10 Narvests, and Days from 
Planting
to Narvest on 149 Mybrids Planted at Tatllassee, Alabama, March 
31, 1988
Days to Days to _Pct, moisture 
by hprvest date and days after 
planting
i
Brand Hybrid silking maturity
2  
7/21 7/28 8/1 814 8/8 8/11 8/15 8/18 8/22 8/25
35% 252 (112) (119) (123) (126) (130) (133) (137) (140) (144) (147)
AgraTech GK 750 84
GK 825 83
GK 850 84
GK 900 84
888 84
917 78
921W 84
EXP 8901 89
AgriPro AP 510 86
AP 670 86
AP 793 84
AP 850 85
818 84
820 78
EX 714 85
Asgrow/ RX 860 85
O's Gold RX 956 w 84
2570 78
5509 84
Cargill 8027 78
8967 82
8990 84
9400 W 84
9427 84
SX 16A 84
Coker 21 84
833 W 78
8601 86
8625 89
8690 84
8696 85
8701 84
Cx 5058 84
CX 7681 85
121 131
125 133
123 133
124 140
124 138
128 144
128 143
124 138
120 130
121 133
124 136
126 139
120 130
121 134
125 133
122 137
129 140
120 132
128 139
121 132
125 134
122 136
121 139
127 137
122 134
126 138
130 148
125 134
121 133
125 138
127 137
121 134
124 136
126 135
45 32 33 30 26 23 22
49 42 39 32 30 23 22
48 40 35 30 29 25 23
47 41 39 32 30 31 27
47 39 34 31 30 28 25
49 45 40 37 33 31 28
57 46 38 43 32 31 27
51 41 32 32 30 26 25
42 38 30 27 24 24 21
48 40 33 28 27 26 22
47 39 38 30 29 26 23
49 43 33 35 28 28 26
43 38 28 27 26 23 21
48 37 30 28 27 25 22
49 44 38 29 29 25 23
45 40 33 32 29 26 25
50 42 41 38 35 33 27
48 36 29 27 26 24 21
53 45 36 37 32 30 26
44 40 30 29 26 25 22
46 42 36 32 34 25 23
49 38 35 29 27 27 24
44 41 33 30 30 28 26
50 40 35 36 33 30 24
50 42 33 30 28 26 22
48 46 41 33 29 29 25
51 44 38 36 39 34 29
48 42 34 35 29 26 21
47 43 32 28 28 26 22
46 42 36 34 33 27 25
49 42 39 33 33 28 24
47 40 31 29 30 26 23
45 42 36 32 29 26 24
55 45 37 35 35 27 23
21 20
23 22
22 21
25 24 21
24 21
26 25 24
28 23 24
25 22 21
22 19
22 20
23 21
25 23 22
21 20
22 22
22 20
23 21
24 22
22 21 -
25 23 23
20 20
23 22
24 22
25 23 21
24 21
21 21 -
25 23 20
27 27 26
21 19
22 21
24 21 -
25 20 19
21 21
23 20
23 21
(Continued)
-5-
Table I (Continued), Corn Grain Moisture Percentage 
from 10 Harvests, and Days from Planting to Harvest
on 149 Hybrids Planted at Tat lasse, Alabma, March 31, 
1988
Days to Days to Pet, 
moisture, by harvest date and 
days after otantingi
$rand Hybrid silking sat.u~zrl 7/21 7/28 
8/1 8/4 8/8 8/11 8/15 8/18 8/22 8/25
35% 25% (112) (119) (123) (126) (130) (133) (137) 
(140) (144) (147)
Crist C-6112 83 122 132 47 
32 36 27 26 25 24 23 20
Dekalb DK 77 W 84
DK 636 78
DK 649 85
DK 656 83
DK 689 84
DK 7 11 84
DK 789 84
EXP 765 U 78
EXP 775 U 84
Deltapine 5666 84
5750 83
X 9986 85
Fft 747 C
929 U
15982
15983
16049
Funk's G-4522 85
G-4543 86
G-4614 86
G-4665 84
G-4666 85
G-4734 88
G-4743 86
G-4868 88
RA 1502 85
6043 U 84
6058 U 84
7046 X 84
8018 x 85
48
50
53
41
48
51
47
'7
46
54
49
52
44
46
121 129 47
124 138 49
130 145 53
50
50
A6
50
56
52
49
48
45
48
52
51
52
49
48
51
52
51
41 35
43 32
45 43
30 28
39 34
45 42
39 28
42 37
38 30
43 42
44 39
45 40
37 32
39 39
38 31
40 35
45 36
44 32
42 37
39 33
40 36
45 38
42 36
46 37
47 33
40 33
51 34
48 39
46 42
46 41
42 37
4 1 31
47 37
44 36
36 38
32
34
32
27
29
37
26
31
28
33
30
34
28
33
27
32
40
28
39
31
29
35
30
29
32
32
36
39
35
41
3'
34
31
33
39
26
30
35
26
28
36
25
29
25
32
28
37
28
33
25
30
31
26
35
26
36
33
28
29
27
28
29
29
36
35
30
30
30
32
31
23
27
28
23
26
29
22
26
25
31
27
33
25
27
25
30
32
24
29
26
28
30
26
24
25
27
28
28
32
28
26
29
27
26
35
21 21 19
24 24 21
25 26 22 22
21 22 20
24 24 20
30 27 25 24
22 21 19
23 22 21 -
22 22 21
28 26 22 22
26 24 22
27 27 25 24
23 23 21
26 25 23
20 2 1 20
25 22 23
26 27 26 24
21 21 19
26 26 24 22
20 22 20
25 22 21
26 25 22 22
22 24 19
23 21 21
25 22 21
26 24 22
24 24 23
24 25 23 22
27 27 26 21
26 27 26 25
23 23 15 21
25 25 23 22
25 24 21
23 24 21
28 25 24 24
(Continued)
-6-
C-7115 84
C -7118V 83
C-7125 84
C-8110 78
C-8119 85
123 131
125 137
128 139
116 129
122 134
129 145
121 129
124 135
121 131
126 140
125 140
128 145
120 135
125 139
84
88
83
84
89
122 137
128 138
122 131
126 137
128 138
124 135
125 133
123 133
122 138
127 137
127 134
131 140
129 146
125 134
125 138
125 137
126 135
129 141
Table I (Continued)aCorn Grain Moisture Percentage from 10 Harvests, and Days from Planting to Harvest
on 149 Hybrids at Tallassee, Alabama, March 31, 1988
Days to Days to Pct. moisture, 
by harvest dote end days after planting 
I
Brand Hybrid silking maturltV
2  
7/21 7/28 8/1 8/4 8/8 8/11 8/15 8/18 8/22 8/25
35% 25% (112 (119) (123) (126) (130) (133) (137) (140) (144) (147)
a r s 8116 84
8180 89
8344 84
HyPerformer HS 56
HS 60
HS 64
HS 97
Jacques H 210
7820
7900
8210
8250
8280
8350
8400
8700
9220
McCurdy 87-77
7372
7777
7800
8172
NC+
Hew
Nor thrup
K ing
84
84
84
84
78
83
78
84
84
84
84
84
84
86
86
85
84
78
78
5891 84
6414 85
7507 79
Mc~airSO8 86
PX 79 85
PX 95 84
PX 9581 84
S 7686 84
s 7751 83
S 8645 83
x 8727 84
123 136 45 40 35 30 29 26 21 22
129 142 54 46 35 33 35 31 24 .26
122 134 51 39 34 29 27 26 22 22
123 132 39 44 36 29 28 24 21 20
123 134 48 38 31 33 29 25 23 21
125 136 45 40 36 33 32 26 25 23
126 136 54 43 34 34 30 33 22 24
124 139 47 40 37 32 29 28 24 24
121 131 45 39 28 28 26 23 21 22
120 130 48 36 30 27 26 23 21 22
124 135 48 46 33 29 31 26 24 23
125 139 49 33 34 31 27 22 25
121 133 46 40 31 29 26 24 22 23
124 134 49 36 36 31 28 26 24 23
125 137 45 41 38 33 32 27 24 25
127 137 55 47 38 36 32 29 25 25
126 141 49 47 37 34 31 29 25 26
129 141 53 43 37 34 37 33 27 26
123 133 48 40 29 30 29 24 22 22
125 138 47 42 34 37 30 30 25 24
127 140 49 42 39 35 33 29 27 24
127 142 50 42 37 33 38 28 27 28
22
23 22
19
19
20
22
22
23 21
20 20
20
21
21
21
21
24 22
23 22
24 22
25 24
2 1
23
23
25 24
122 133 49 40 31 29 28 25 23 22- 19
126 136 52 43 32 38 27 28 24 24 19
125 135 50 42 38 29 30 26 22 21 21
137 148 62 54 51 46 39 34 38 29
124 133 56 43 36 30 27 24 23 21
130 143 56 48 38 42 37 31 27 28
124 134 48 43 35 31 28 25 24 24
125 134 49 43 34 32 29 26 22 22
122 132 47 40 30 28 27 24 22 22
125 137 50 41 39 33 29 28 24 24
123 137 48 41 33 31 33 27 25 24
28 25
20
25 24
22
20
519
22
23
(Cont inuaed)
-7-.
Table I (Continued), Corn Grain Hoisture Percentage from 10 Harvsts, and Days from Planting to Harvest
on 149 Hybrids Planted at Tallassee. Alabama, March 31, 1988
Daya to Days to Pct. moisture. by harvest date and days 
after Rlanting
1
Hybrid silkino maturity
2  
7/21 7/28 8/1 8/4 8/8 8/11 8/15 8/18 8/22 8/25
35% 25% (112) (119) (123) (126) (130) (133) (137) (140) (144) (147)
Pioneer 3055 82
3140 84
3144 W 84
3147 84
3165 85
3187 84
3283 W 84
3295 86
3320 84
3343 78
3358 85
SeedTec ST 2601 84
ST 7711 83
ST 7750 85
S0 4000 84
S0 5020 84
S0 6040 84
S0 6080 W 84
128 143
125 136
125 138
129 143
128 143
130 141
127 139
125 136
125 138
122 132
121 135
121 132
125 139
125 136
123 133
127 139
127 140
128 142
53 46
48 44
47 41
54 47
53 45
52 46
47 45
49 42
46 40
46 40
49 41
52 43
51 44
51 43
51 42
52 42
46 42
54 45
42 35
38 33
38 30
40 35
43 38
41 35
33 38
34 35
35 36
28 32
33 28
33 28
37 32
39 33
32 31
39 33
38 37
42 31
32
30
33
37
32
36
31
30
28
26
28
26
31
27
29
3'
33
32
Summit TR 1185 86 124 136 47 42 35 31 33
TR 3303 84 121 129 49 37 32 27 24
TR 4405 84 128 140 56 44 38 38 341
Sunbelt 1802
1827
1860
1876
1882
5613
6225
7400
7705
84
84
84
83
83
85
85
84
85
TR 363 E 84
TI 364 E 84
TB 365 E 83
TB 366 E 83
TB 402 E 84
122 134 47 38
126 137 53 46
135 143 53 47
138 149 59 55
130 149 52 46
125 134 48 42
127 136 52 43
130 145 47 46
124 138 52 45
123 135 48 42
125 136 49 41
125 135 47 43
121 134 49 42
124 138 53 42
36 29
40 34
39 42
42 48
37 37
36 35
38 35
44 42
36 32
35 32
34 33
29 30
32 27
35 32
28
32
39
37
33
28
33
38
30
30
31
31
33
30
29 28
27 24
27 26
35 26
29 26
34 24
28 23
26 24
27 25
25 21
26 24
26 23 22
29 25 25
28 25 23
24 22
28 27
27 28
29 27
27 24
21 20
31 26
25 23
30 25
38 29
39 37
36 29
26 22
28 24
35 26
27 26
26 23
25 25
26 23
26 23
27 25
(Cont inued)
-0
Brand
23
23
26
23
25
22
24
27
27
26
24
23
24
21
24
26
21
24
24
24
22
22
22
23
20
22
Soar
Trr a
22
22 21
20
20
22
21
24 23
22
19
22
23
23
24 25
29 27
26 26
21
25 22
25 24
22
2 1
21
20
2 1
23 22
22
24
26
26
24
21
25
24
24
28
33
28
22
25
29
24
22
23
22
23
25
~~L 1 rr 1__ ~__)_ Y_)_-
Table I (Continued)* Corn Grain Moisture Percentage from 10 Harvests, and Days from Planting to Harvest
on 149 Hybrids Planted at Tallassee, Alabama, March 31, 1988
Days to Days to Pct. 
moisture, by harvest date 
and days after Rtant lnI
Hybrid silking maturity
2  
7/21 7/28 8/1 8/4 8/8 8/11 8/15 8/18 8/22 
8/25
35% 25% (012) (19) 123) 126) (130) (133) (137) (140) (144) (147)
Triumph 1595 83 120 131 48
1650 FG 84 128 142 50
2020 85 124 137 47
Zimmerman Z 14 W
Z 16 W
Z 17 W
Z 27
Z 31
Z 33
Z 54 W
Z 60 W
84 126 142 47
88 128 140 46
88 129 140 48
78 123 135 48
83 122 134 50
79 123 136 46
85 130 145 50
85 128 142 49
36 28 27 26 25
43 37 39 34 30
40 33 34 30 28
43 39 34 32 30
41 41 37 31 29
45 41 43 34 30
40 30 30 27 26
40 31 29 27 26
38 32 34 29 27
44 37 35 38 33
44 40 39 3 1 29
22 21 20
26 27 23 23
24 23 22
27 29 25 24
26 25 23. 24
27 26 23 23
23 23 21
22 22 21
24 24 22 21
28 29 25 24
27 27 24 23
Numbers in parenthesis are days from ptanting to harvest for each harvest date.
2
Physiological maturity at 35 percent moisture; combine maturity at 
25 percent moisture.
Table 2. Air Temperature (Maximum and Minimum) and Precipitation by Date and Month at Plant
Breeding Unit, Tallassee, Alabama, 1988
Dte
2
3
4
5
6
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TotalI
March Apri t May
Air temp. OF Precip., A ir temp. OF Precip., Air temp. OF Precip .
Max. Min inches Max. Min. inches max. Min. inches
72
77
70
66
45
71
78
68
75
52
70
67
64
52
52
57
67
50
55
71
79
83
80
79
69
79
74
80
82
79
83
31
32
55
59
56
36
39
46
58
42
31
43
54
37
27
26
29
40
40
31
37
40
50
52
55
58
41
37
50
59
59
79
71
73
1.00 83
89
73
75
79
.80 79
.12 84
64
57
.09 76
81
83
71
82
.14 83
.38 67
73
83
78
84
72
1.10 70
79
72
75
72
62
61
61
60
50
61
51
46
50
'9
52
42
4'
44
48
49
44
61
60
39
46
56
68
66
60
60
53
44
42
50
3.63
.08 79
82
.38 81
80
76
83
85
84
78
.51 82
8 1
Praal
84
89
85
87
.31 83
1.60 83
86
89
a
.46 85
.86 84
.96 79
78
81
85
89
9 1
90
5.27
47
'5
48
53
50
'5
49
55
54
68
52
53
62
56
59
64
60
54
55
55
59
62
64
63
63
57
49
52
56
58
61
P1.45f04
25
.12
84
2.66
(Cot inued)
-9-
Brand
~ - I ~II I~ ~~ ~~ I ~~ ~\~~~ C11 CI Y
I ~u r oJ I~u ~u rr
I --- -
I
Table 2. (Continued), Air Temperature (Maximum and Minimun) and Precipitation by Date and Month at
Plant Sreeding Unit, Taltassee, Alabama, 1988
June July August
Date Air temp. *' Precip., Air temp, *F Precip., Air temp. *F Precip.,
ax. Min. Inches Max. Min. Inches Max. Min. inches
1 90 59 - 95 70
2 93 60 - - 3.40 93 72
3 90 63 94 71
4 80 65 93 69 .07
5 79 60 .07 91 71
6 87 63 92 70
7 87 68 .07 87 90 71
8 91 66 .90 90 62 91 73
9 91 67 92 68 91 73
10 79 59 88 72 .72 94 71 .70
11 83 53 85 73 .98 92 73
12 86 56 89 72 .28 90 75
13 87 56 90 71 93 72
14 88 57 - - 93 70
15 90 59 - - 88 74 .50
16 95 63 - - 2.35 91 72
17 96 65 " - 91 71
18 94 68 89 73 T 95 71
19 83 67 90 70 93 72
20 93 65 91 71 92 74
21 96 66 92 72 .22 88 74 .09
22 97 67 86 73 T 94 72
23 96 69 - 70 93 73
24 97 73 " " 85 72
25 100 72 .64 90 65 94 69 .10
26 96 71 1.65 86 67 96 64
27 94 72 90 70 96 67
28 - - 91 69 93 68
29 - 92 69 95 68
30 - - 93 71 - 72
31 - - 94 72
Total 3.26 8.02 1.46
Information contained herein is available to all without regardless to
race, color, sex, or national origin.
-10-