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| Response variable | ||||
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| Corn density | Corn height | Italian ryegrass biomass | Corn yield | |
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| Early season | Late season |
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| Year | Population | Density |
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| # m−1 corn row | # ha−1 | # ha−1 | cm | kg∙ha−1 | kg∙ha−1 |
| 2012 | GR | 0 | 78,333 | 63,333 | 127 | - | 13,354 |
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| 1 | 71,667 | 63,333 | 89 | 68,695 | 10,989 |
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| 2 | 56,667 | 63,333 | 65 | 104,966 | 9599 |
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| 3 | 45,000 | 52,500 | 56 | 72,775 | 7329 |
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| 4 | 28,333 | 35,000 | 56 | 88,596 | 5384 |
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| GS | 0 | 83,333 | 62,500 | 127 | - | 14,383 |
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| 1 | 70,000 | 68333 | 09 | 100,603 | 10,855 |
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| 2 | 48,333 | 69,167 | 70 | 80,660 | 9691 |
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| 3 | 55,000 | 75,000 | 60 | 85,905 | 9541 |
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| 4 | 53,333 | 55,000 | 68 | 98,322 | 7372 |
| 2013 | GR | 0 | 88,333 | 85,000 | 70 | - | 10,862 |
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| 1 | 46,667 | 47,500 | 48 | 47,923 | 8892 |
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| 2 | 50,000 | 48,333 | 44 | 101,453 | 7783 |
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| 3 | 25,000 | 25,833 | 39 | 134,338 | 6058 |
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| 4 | 30,000 | 34,167 | 41 | 179602 | 6822 |
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| GS | 0 | 93,333 | 83,333 | 70 | - | 19,566 |
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| 1 | 90,000 | 80,833 | 64 | 38,173 | 13,703 |
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| 2 | 75,000 | 76,667 | 63 | 70,487 | 14,006 |
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| 3 | 60,000 | 66,667 | 58 | 110,726 | 12,506 |
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| 4 | 55,000 | 58,333 | 70 | 138,728 | 13,712 |