What question did this study set out to answer?

To identify key reflectance wavelengths and evaluate calibration models for estimating nitrogen concentration in citrus leaves to facilitate real-time sensor development.

January 1, 2005Transactions of the ASAE

Determination of Significant Wavelengths and Prediction of Nitrogen Content for Citrus

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Authors

MMManki MinLouisiana Tech University WLWon Suk LeeDiponegoro University

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Implication

Spectroscopic analysis demonstrates accurate nitrogen prediction in citrus leaves using specific reflectance wavelengths, suggesting potential for real-time field sensors.

Key Points

To identify key reflectance wavelengths and evaluate calibration models for estimating nitrogen concentration in citrus leaves to facilitate real-time sensor development.
Measured laboratory diffuse reflectance across 400 to 2500 nm on leaf samples from citrus trees given five nitrogen application rates (0, 112, 168, 224, and 280 kg ha⁻¹).
Identified significant wavelengths using a correlation coefficient spectrum, stepwise multiple linear regression (SMLR), and the B-matrix of partial least squares (PLS) regression.
Both SMLR and PLS consistently selected 448, 669, 719, 1377, 1773, and 2231 nm as key wavelengths for citrus nitrogen detection.
The best SMLR calibration model, applied to a 20 nm averaged dataset with lower collinearity, achieved a validation R² of 0.839 and a root mean square difference (RMSD) of 0.122%.
The PLS model applied across the full spectral region achieved a validation R² of 0.828 and an RMSD of 0.122%.

Cite This Study

Min et al. (2005) studied this question.

synapsesocial.com/papers/69dd2c3a7808b00a4799b4f2 https://doi.org/10.13031/2013.18308

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Implication

Spectroscopic analysis demonstrates accurate nitrogen prediction in citrus leaves using specific reflectance wavelengths, suggesting potential for real-time field sensors.

Determination of Significant Wavelengths and Prediction of Nitrogen Content for Citrus

Discussion

Member takes

Implication

Key Points

Cite This Study

Determination of Significant Wavelengths and Prediction of Nitrogen Content for Citrus

Discussion

Member takes

Implication

Key Points

Cite This Study

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