A Cost-Effective and Portable Optical Sensor System to Estimate Leaf Nitrogen and Water Contents in Crops

Sensors
Mohammad HabibullahAnh Dinh

Abstract

Non-invasive determination of leaf nitrogen (N) and water contents is essential for ensuring the healthy growth of the plants. However, most of the existing methods to measure them are expensive. In this paper, a low-cost, portable multispectral sensor system is proposed to determine N and water contents in the leaves, non-invasively. Four different species of plants-canola, corn, soybean, and wheat-are used as test plants to investigate the utility of the proposed device. The sensor system comprises two multispectral sensors, visible (VIS) and near-infrared (NIR), detecting reflectance at 12 wavelengths (six from each sensor). Two separate experiments were performed in a controlled greenhouse environment, including N and water experiments. Spectral data were collected from 307 leaves (121 for N and 186 for water experiment), and the rational quadratic Gaussian process regression (GPR) algorithm was applied to correlate the reflectance data with actual N and water content. By performing five-fold cross-validation, the N estimation showed a coefficient of determination () of 63.91% for canola, 80.05% for corn, 82.29% for soybean, and 63.21% for wheat. For water content estimation, canola showed an of 18.02%, corn showed an of 68...Continue Reading

References

Jan 1, 1960·Psychological Bulletin·C A BONEAU
Apr 28, 2004·International Journal of Neural Systems·Matthias Seeger
Dec 27, 2016·Computational and Structural Biotechnology Journal·Mohammad R MohebianFariborz Mokarian
Aug 22, 2017·Frontiers in Plant Science·Piyush PandeyJames C Schnable
Sep 6, 2018·Journal of Medical Signals and Sensors·Fatemeh Safaei FirouzabadiMohammadreza Mohebian
Oct 22, 2018·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Chao NiYang Tao
Dec 14, 2018·Frontiers in Plant Science·Francisco M PadillaRodney B Thompson

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Methods Mentioned

BETA
light spectroscopy

Software Mentioned

atLEAF
MATLAB
GreenSeeker
Green
GPR

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