Plant Soil Environ., 2016, 62(4):178-183 | DOI: 10.17221/802/2015-PSE
Estimation of nitrogen content based on fluorescence spectrum and principal component analysis in paddy riceOriginal Paper
- 1 State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, P.R. China
- 2 Collaborative Innovation Center of Geospatial Technology, Wuhan, P.R. China
- 3 School of Resource and Environmental Sciences, Wuhan University, Wuhan, P.R. China
- 4 School of Physics and Technology, Wuhan University, Wuhan, P.R. China
- 5 Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan,
Paddy rice is one of the most important cereal crops in China. Nitrogen (N) is closely related to crops production by influencing the photosynthetic efficiency of paddy rice. In this study, laser-induced fluorescence (LIF) technology with the help of principal component analysis (PCA) and back-propagation neural network (BPNN) is proposed to monitor leaf N content (LNC) of paddy rice. The PCA is utilized to extract the characteristic variables of LIF spectra by analysing the major attributes. The results showed that the first three principal components (PCs) can explain 95.76% and 93.53% of the total variance contained in the fluorescence spectra for tillering stage and shooting stage, respectively. Then, BPNN was utilized to inverse the LNC on the basis of the first three PCs as input variables and can obtain the satisfactory inversion results (R2 of tillering stage and shooting stage are 0.952 and 0.931, respectively; residual main range from -0.2 to 0.2 mg/g). The experimental results demonstrated that LIF technique combined with multivariate analysis will be a useful method for monitoring the LNC of paddy rice, which can provide consultations for the decision-making of peasants in their N fertilization strategies.
Keywords: remote sensing; Oryza sativa; macroelement; environmental pollution; leaf nitrogen content
Published: April 30, 2016 Show citation
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