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The fitted regression between nitrogen (N) rates (x) and grain yield (y)
| Planting densities | Fitted equations | R 2 | p |
|---|---|---|---|
| D4 | y = − 0.0669x2 + 20.243x + 6473.3 | 0.8636 | 0.42793 |
| D3 | y = − 0.0475x2 + 14.651x + 5601.5 | 0.9629 | 0.16541 |
| D2 | y = − 0.0757x2 + 20.504x + 5222.3 | 0.9917 | 0.11260 |
| D1 | y = − 0.0491x2 + 13.566x + 5008.5 | 0.9939 | 0.17084 |
D represents planting density
