Excpected Grain Yield Due to Various Planting Dates and Final Plant Populations |
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Planting Date |
Plant Population (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 |
|
10-Apr |
62 |
68 |
73 |
78 |
82 |
85 |
88 |
91 |
92 |
93 |
94 |
94 |
93 |
91 |
15-Apr |
65 |
71 |
76 |
81 |
85 |
88 |
91 |
94 |
95 |
96 |
97 |
96 |
96 |
94 |
20-Apr |
67 |
73 |
78 |
83 |
87 |
90 |
93 |
96 |
97 |
98 |
99 |
98 |
98 |
96 |
25-Apr |
68 |
74 |
79 |
84 |
88 |
92 |
94 |
97 |
98 |
99 |
100 |
100 |
99 |
97 |
30-Apr |
68 |
74 |
79 |
84 |
88 |
92 |
95 |
97 |
99 |
100 |
100 |
100 |
99 |
97 |
5-May |
67 |
73 |
79 |
83 |
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 | ||||||||||||||
Note: The highlighted area represents the optimum ranges (98 to 100% yield) of plant populations and pointing dates for produtivity levels greater than about 125 bushels per acre. Optimum plant populations for soils with historical yields less than about 100 bushels per acre will likely not respond to final plant populations greater than about 24,000 plants per acre. (RLNielsen, Purdue Agronomy)
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