Table 6 Correlation coefficient between NO₃⁻–N content of petioles and vegetation indices

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

Type of reflectivity	Vegetation indices	Correlation coefficients
First derivative	RD	− 0.85**
	CI_red-edge	− 0.89**
	NDRE	− 0.80**
	ND705	− 0.90**
	NIR	− 0.62**
	RI-1 dB	− 0.72**
Original	RD	− 0.81**
	CI_red-edge	− 0.74**
	NDRE	− 0.77**
	ND705	− 0.76**
	NIR	− 0.79**
	RI-1 dB	− 0.77**

**Means significant at the level of p < 0.01

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ISSN: 1746-4811

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