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Table 9 Validation between predicted and measured of NO3−–N content in petioles based on different methods

From: Estimation of nitrate nitrogen content in cotton petioles under drip irrigation based on wavelet neural network approach using spectral indices

Methods

Blue edge parameters

Vegetation indices

Number of samples

R2

RSME (g/L)

MAE (g/L)

Number of samples

R2

RSME (g/L)

MAE (g/L)

WNN

60

0.88

0.65

0.47

60

0.82

0.87

0.68

RF

60

0.82

0.79

0.60

60

0.82

0.92

0.76

RBF

60

0.81

0.80

0.61

60

0.82

0.88

0.72

BP

60

0.77

0.89

0.65

60

0.74

1.02

0.81