Table 1. Expected corn grain yield due to various planting dates and final plant populations
Planting Date
Plant populations (final) per acre.
10,000
12,000
14,000
16,000
18,000
20,000
22,000
24,000
26,000
28,000
30,000
32,000
34,000
36,000
Percent of optimum yield
10-April
62
68
73
78
82
85
88
91
92
93
94
94
93
91
15-April
65
71
76
81
85
88
91
94
95
96
97
96
96
94
20-April
67
73
78
83
97
90
93
96
97
98
99
98
98
96
25-April
96
74
79
84
88
92
94
97
98
99
100
100
99
97
30-April
68
74
79
84
88
92
95
97
99
100
100
100
99
97
05-May
67
73
79
82
87
91
94
96
98
99
99
99
98
97
10-May
65
71
77
82
86
89
92
94
96
97
97
97
96
95
15-May
63
69
74
79
83
87
89
92
93
94
95
95
94
92
20-May
59
65
71
75
80
83
86
88
90
91
91
91
90
89
25-May
55
61
66
71
75
79
81
84
85
86
87
87
86
84
30-May
49
55
61
65
70
73
76
78
80
81
81
81
80
79
Source: Nafziger. 1994. J. Prod. Ag 7:59-62