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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