Table 1.4-8B. Estimated grain yields for various planting dates and population rates
| Planting date | Plants/A at harvest | ||||||
|---|---|---|---|---|---|---|---|
| 10,000 | 15,000 | 20,000 | 25,000 | 30,000 | 35,500 | 40,000 | |
| Optimum yield (percent) | |||||||
| Source: University of Illinois | |||||||
| April 1 | 54 | 68 | 78 | 88 | 95 | 99 | 99 |
| April 10 | 57 | 70 | 81 | 91 | 97 | 100 | 100 |
| April 20 | 58 | 71 | 81 | 91 | 97 | 100 | 99 |
| April 30 | 58 | 70 | 80 | 89 | 95 | 97 | 96 |
| May 9 | 55 | 68 | 77 | 86 | 91 | 93 | 91 |
| May 19 | 50 | 63 | 72 | 80 | 85 | 86 | 84 |
| May 29 | 44 | 56 | 65 | 73 | 77 | 78 | 75 |
| June 8 | 35 | 47 | 56 | 63 | 67 | 67 | 64 |
