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Table 1 The fitted regression between nitrogen (N) rates (x) and grain yield (y)

From: Evaluation of grain yield based on digital images of rice canopy

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
  1. D represents planting density