Section 4 Table of Contents

Table 1.4-8A. Estimated grain yields for various planting dates and population rates.
Planting date Plants/A at harvest
10,000 12,500 15,000 17,500 20,000 22,500 25,000 27,500 30,000
% of optimum yield
Figures shown are most applicable to corn fields with greater than 125 bushels per acre.
Source: University of Illinois
April 10 62 70 76 82 86 90 92 94 94
April 15 65 73 79 84 89 92 95 97 97
April 20 67 74 81 86 91 94 97 98 99
April 25 68 75 82 87 92 95 98 99 100
April 30 68 75 82 87 92 95 98 99 100
May 4 67 75 81 86 91 94 97 99 99
May 9 65 73 79 85 89 93 95 97 97
May 14 63 70 76 82 86 90 92 94 95
May 19 59 66 73 78 83 86 89 90 91
May 24 54 62 68 74 78 82 84 86 86
May 29 49 56 63 68 73 76 79 80 81